diff --git a/src/CodeGenerator/src/Generator/InputGenerator.php b/src/CodeGenerator/src/Generator/InputGenerator.php
index 4e21f1105b..4cf37eee8d 100644
--- a/src/CodeGenerator/src/Generator/InputGenerator.php
+++ b/src/CodeGenerator/src/Generator/InputGenerator.php
@@ -389,9 +389,9 @@ private function inputClassRequestGetters(StructureShape $inputShape, ClassBuild
         $serializer = $this->serializer->get($operation->getService());
 
         if ((null !== $payloadProperty = $inputShape->getPayload()) && $inputShape->getMember($payloadProperty)->isStreaming()) {
-            $body['header'] = '$headers = [];' . "\n";
+            $body['header'] = '$headers = ' . $serializer->getHeaders($operation, false) . ';' . "\n";
         } else {
-            $body['header'] = '$headers = ' . $serializer->getHeaders($operation) . ';' . "\n";
+            $body['header'] = '$headers = ' . $serializer->getHeaders($operation, true) . ';' . "\n";
         }
 
         $body['querystring'] = '$query = [];' . "\n";
diff --git a/src/CodeGenerator/src/Generator/RequestSerializer/JsonRpcSerializer.php b/src/CodeGenerator/src/Generator/RequestSerializer/JsonRpcSerializer.php
index 810b2cd9ae..58251e6f9c 100644
--- a/src/CodeGenerator/src/Generator/RequestSerializer/JsonRpcSerializer.php
+++ b/src/CodeGenerator/src/Generator/RequestSerializer/JsonRpcSerializer.php
@@ -15,18 +15,19 @@
  */
 class JsonRpcSerializer extends RestJsonSerializer
 {
-    public function getHeaders(Operation $operation): string
+    public function getHeaders(Operation $operation, bool $withPayload): string
     {
-        return strtr(<<<PHP
-[
-    'Content-Type' => 'application/x-amz-json-VERSION',
-    'X-Amz-Target' => 'TARGET',
-];
+        if (!$withPayload) {
+            return "['Accept' => 'application/json']";
+        }
 
-PHP
-            , [
-                'VERSION' => number_format($operation->getService()->getJsonVersion(), 1),
-                'TARGET' => sprintf('%s.%s', $operation->getService()->getTargetPrefix(), $operation->getName()),
-            ]);
+        return strtr("[
+            'Content-Type' => 'application/x-amz-json-VERSION',
+            'X-Amz-Target' => 'TARGET',
+            'Accept' => 'application/json',
+        ]", [
+            'VERSION' => number_format($operation->getService()->getJsonVersion(), 1),
+            'TARGET' => sprintf('%s.%s', $operation->getService()->getTargetPrefix(), $operation->getName()),
+        ]);
     }
 }
diff --git a/src/CodeGenerator/src/Generator/RequestSerializer/QuerySerializer.php b/src/CodeGenerator/src/Generator/RequestSerializer/QuerySerializer.php
index e2f4c47f11..2fd6e4a674 100644
--- a/src/CodeGenerator/src/Generator/RequestSerializer/QuerySerializer.php
+++ b/src/CodeGenerator/src/Generator/RequestSerializer/QuerySerializer.php
@@ -43,9 +43,13 @@ public function __construct(NamespaceRegistry $namespaceRegistry, RequirementsRe
         $this->requirementsRegistry = $requirementsRegistry;
     }
 
-    public function getHeaders(Operation $operation): string
+    public function getHeaders(Operation $operation, bool $withPayload): string
     {
-        return '["content-type" => "application/x-www-form-urlencoded"]';
+        if (!$withPayload) {
+            return '[]';
+        }
+
+        return "['content-type' => 'application/x-www-form-urlencoded']";
     }
 
     public function generateRequestBody(Operation $operation, StructureShape $shape): SerializerResultBody
diff --git a/src/CodeGenerator/src/Generator/RequestSerializer/RestJsonSerializer.php b/src/CodeGenerator/src/Generator/RequestSerializer/RestJsonSerializer.php
index c90ec532c5..63e1c24a71 100644
--- a/src/CodeGenerator/src/Generator/RequestSerializer/RestJsonSerializer.php
+++ b/src/CodeGenerator/src/Generator/RequestSerializer/RestJsonSerializer.php
@@ -43,9 +43,16 @@ public function __construct(NamespaceRegistry $namespaceRegistry, RequirementsRe
         $this->requirementsRegistry = $requirementsRegistry;
     }
 
-    public function getHeaders(Operation $operation): string
+    public function getHeaders(Operation $operation, bool $withPayload): string
     {
-        return '["content-type" => "application/json"]';
+        if (!$withPayload) {
+            return "['Accept' => 'application/json']";
+        }
+
+        return "[
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ]";
     }
 
     public function generateRequestBody(Operation $operation, StructureShape $shape): SerializerResultBody
diff --git a/src/CodeGenerator/src/Generator/RequestSerializer/RestXmlSerializer.php b/src/CodeGenerator/src/Generator/RequestSerializer/RestXmlSerializer.php
index 3f567bcc15..cbee2402f8 100644
--- a/src/CodeGenerator/src/Generator/RequestSerializer/RestXmlSerializer.php
+++ b/src/CodeGenerator/src/Generator/RequestSerializer/RestXmlSerializer.php
@@ -40,9 +40,13 @@ public function __construct(NamespaceRegistry $namespaceRegistry, RequirementsRe
         $this->requirementsRegistry = $requirementsRegistry;
     }
 
-    public function getHeaders(Operation $operation): string
+    public function getHeaders(Operation $operation, bool $withPayload): string
     {
-        return '["content-type" => "application/xml"]';
+        if (!$withPayload) {
+            return '[]';
+        }
+
+        return "['content-type' => 'application/xml']";
     }
 
     public function generateRequestBody(Operation $operation, StructureShape $shape): SerializerResultBody
diff --git a/src/CodeGenerator/src/Generator/RequestSerializer/Serializer.php b/src/CodeGenerator/src/Generator/RequestSerializer/Serializer.php
index dc9e9cc552..784ff84ab4 100644
--- a/src/CodeGenerator/src/Generator/RequestSerializer/Serializer.php
+++ b/src/CodeGenerator/src/Generator/RequestSerializer/Serializer.php
@@ -27,5 +27,5 @@ public function generateRequestBody(Operation $operation, StructureShape $shape)
      */
     public function generateRequestBuilder(StructureShape $shape, bool $needsChecks): SerializerResultBuilder;
 
-    public function getHeaders(Operation $operation): string;
+    public function getHeaders(Operation $operation, bool $withPayload): string;
 }
diff --git a/src/Service/AppSync/CHANGELOG.md b/src/Service/AppSync/CHANGELOG.md
index cee4d11485..bb709b7b3f 100644
--- a/src/Service/AppSync/CHANGELOG.md
+++ b/src/Service/AppSync/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## NOT RELEASED
 
+### Changed
+
+- Add `Accept: application/json` header in request to fix incompatibility with 3rd party providers
+
 ## 2.1.0
 
 ### Added
diff --git a/src/Service/AppSync/src/Input/CreateResolverRequest.php b/src/Service/AppSync/src/Input/CreateResolverRequest.php
index 2ab25f202e..cbc847f927 100644
--- a/src/Service/AppSync/src/Input/CreateResolverRequest.php
+++ b/src/Service/AppSync/src/Input/CreateResolverRequest.php
@@ -278,7 +278,10 @@ public function getTypeName(): ?string
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/AppSync/src/Input/DeleteResolverRequest.php b/src/Service/AppSync/src/Input/DeleteResolverRequest.php
index d1204a2a84..06bafa087f 100644
--- a/src/Service/AppSync/src/Input/DeleteResolverRequest.php
+++ b/src/Service/AppSync/src/Input/DeleteResolverRequest.php
@@ -86,7 +86,10 @@ public function getTypeName(): ?string
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/AppSync/src/Input/GetSchemaCreationStatusRequest.php b/src/Service/AppSync/src/Input/GetSchemaCreationStatusRequest.php
index aa15708814..fee227fd40 100644
--- a/src/Service/AppSync/src/Input/GetSchemaCreationStatusRequest.php
+++ b/src/Service/AppSync/src/Input/GetSchemaCreationStatusRequest.php
@@ -52,7 +52,10 @@ public function getApiId(): ?string
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/AppSync/src/Input/ListApiKeysRequest.php b/src/Service/AppSync/src/Input/ListApiKeysRequest.php
index ac7095f9c4..4679ee0676 100644
--- a/src/Service/AppSync/src/Input/ListApiKeysRequest.php
+++ b/src/Service/AppSync/src/Input/ListApiKeysRequest.php
@@ -83,7 +83,10 @@ public function getNextToken(): ?string
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/AppSync/src/Input/ListResolversRequest.php b/src/Service/AppSync/src/Input/ListResolversRequest.php
index 4d48d6953f..5ebc7f8222 100644
--- a/src/Service/AppSync/src/Input/ListResolversRequest.php
+++ b/src/Service/AppSync/src/Input/ListResolversRequest.php
@@ -100,7 +100,10 @@ public function getTypeName(): ?string
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/AppSync/src/Input/StartSchemaCreationRequest.php b/src/Service/AppSync/src/Input/StartSchemaCreationRequest.php
index 29f59d408d..dd77a2c6e8 100644
--- a/src/Service/AppSync/src/Input/StartSchemaCreationRequest.php
+++ b/src/Service/AppSync/src/Input/StartSchemaCreationRequest.php
@@ -69,7 +69,10 @@ public function getDefinition(): ?string
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/AppSync/src/Input/UpdateApiKeyRequest.php b/src/Service/AppSync/src/Input/UpdateApiKeyRequest.php
index 565744375d..ed9b48e94f 100644
--- a/src/Service/AppSync/src/Input/UpdateApiKeyRequest.php
+++ b/src/Service/AppSync/src/Input/UpdateApiKeyRequest.php
@@ -100,7 +100,10 @@ public function getId(): ?string
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/AppSync/src/Input/UpdateDataSourceRequest.php b/src/Service/AppSync/src/Input/UpdateDataSourceRequest.php
index 744e347736..270e59dc3f 100644
--- a/src/Service/AppSync/src/Input/UpdateDataSourceRequest.php
+++ b/src/Service/AppSync/src/Input/UpdateDataSourceRequest.php
@@ -259,7 +259,10 @@ public function getType(): ?string
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/AppSync/src/Input/UpdateResolverRequest.php b/src/Service/AppSync/src/Input/UpdateResolverRequest.php
index 2ec6d2bbb8..798eadc1fa 100644
--- a/src/Service/AppSync/src/Input/UpdateResolverRequest.php
+++ b/src/Service/AppSync/src/Input/UpdateResolverRequest.php
@@ -278,7 +278,10 @@ public function getTypeName(): ?string
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/Athena/CHANGELOG.md b/src/Service/Athena/CHANGELOG.md
index d9dc6e0dcb..bdfbe4ae89 100644
--- a/src/Service/Athena/CHANGELOG.md
+++ b/src/Service/Athena/CHANGELOG.md
@@ -4,6 +4,7 @@
 
 ### Changed
 
+- Add `Accept: application/json` header in request to fix incompatibility with 3rd party providers
 - AWS enhancement: Documentation updates.
 
 ## 2.2.0
diff --git a/src/Service/Athena/src/Input/GetCalculationExecutionRequest.php b/src/Service/Athena/src/Input/GetCalculationExecutionRequest.php
index 3c464664de..8ce0e26721 100644
--- a/src/Service/Athena/src/Input/GetCalculationExecutionRequest.php
+++ b/src/Service/Athena/src/Input/GetCalculationExecutionRequest.php
@@ -55,6 +55,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AmazonAthena.GetCalculationExecution',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Athena/src/Input/GetCalculationExecutionStatusRequest.php b/src/Service/Athena/src/Input/GetCalculationExecutionStatusRequest.php
index 4208e0439d..17151de0a0 100644
--- a/src/Service/Athena/src/Input/GetCalculationExecutionStatusRequest.php
+++ b/src/Service/Athena/src/Input/GetCalculationExecutionStatusRequest.php
@@ -55,6 +55,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AmazonAthena.GetCalculationExecutionStatus',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Athena/src/Input/GetDataCatalogInput.php b/src/Service/Athena/src/Input/GetDataCatalogInput.php
index 2b7f1d3608..2a497d0147 100644
--- a/src/Service/Athena/src/Input/GetDataCatalogInput.php
+++ b/src/Service/Athena/src/Input/GetDataCatalogInput.php
@@ -70,6 +70,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AmazonAthena.GetDataCatalog',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Athena/src/Input/GetDatabaseInput.php b/src/Service/Athena/src/Input/GetDatabaseInput.php
index 1b9bc27752..603bbfd014 100644
--- a/src/Service/Athena/src/Input/GetDatabaseInput.php
+++ b/src/Service/Athena/src/Input/GetDatabaseInput.php
@@ -88,6 +88,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AmazonAthena.GetDatabase',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Athena/src/Input/GetNamedQueryInput.php b/src/Service/Athena/src/Input/GetNamedQueryInput.php
index 1e6b5fa2b8..b8a3521c6a 100644
--- a/src/Service/Athena/src/Input/GetNamedQueryInput.php
+++ b/src/Service/Athena/src/Input/GetNamedQueryInput.php
@@ -55,6 +55,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AmazonAthena.GetNamedQuery',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Athena/src/Input/GetQueryExecutionInput.php b/src/Service/Athena/src/Input/GetQueryExecutionInput.php
index a582243574..e441c69b39 100644
--- a/src/Service/Athena/src/Input/GetQueryExecutionInput.php
+++ b/src/Service/Athena/src/Input/GetQueryExecutionInput.php
@@ -55,6 +55,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AmazonAthena.GetQueryExecution',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Athena/src/Input/GetQueryResultsInput.php b/src/Service/Athena/src/Input/GetQueryResultsInput.php
index dfe7663f88..9dfb9044e2 100644
--- a/src/Service/Athena/src/Input/GetQueryResultsInput.php
+++ b/src/Service/Athena/src/Input/GetQueryResultsInput.php
@@ -87,6 +87,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AmazonAthena.GetQueryResults',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Athena/src/Input/GetSessionRequest.php b/src/Service/Athena/src/Input/GetSessionRequest.php
index da73c2db1b..e214d4518c 100644
--- a/src/Service/Athena/src/Input/GetSessionRequest.php
+++ b/src/Service/Athena/src/Input/GetSessionRequest.php
@@ -55,6 +55,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AmazonAthena.GetSession',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Athena/src/Input/GetSessionStatusRequest.php b/src/Service/Athena/src/Input/GetSessionStatusRequest.php
index 91d6a8cd2c..af053a1d41 100644
--- a/src/Service/Athena/src/Input/GetSessionStatusRequest.php
+++ b/src/Service/Athena/src/Input/GetSessionStatusRequest.php
@@ -55,6 +55,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AmazonAthena.GetSessionStatus',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Athena/src/Input/GetTableMetadataInput.php b/src/Service/Athena/src/Input/GetTableMetadataInput.php
index a1b3aea13c..ad7ad75485 100644
--- a/src/Service/Athena/src/Input/GetTableMetadataInput.php
+++ b/src/Service/Athena/src/Input/GetTableMetadataInput.php
@@ -105,6 +105,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AmazonAthena.GetTableMetadata',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Athena/src/Input/GetWorkGroupInput.php b/src/Service/Athena/src/Input/GetWorkGroupInput.php
index 5470c364b0..a93663d28e 100644
--- a/src/Service/Athena/src/Input/GetWorkGroupInput.php
+++ b/src/Service/Athena/src/Input/GetWorkGroupInput.php
@@ -55,6 +55,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AmazonAthena.GetWorkGroup',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Athena/src/Input/ListDatabasesInput.php b/src/Service/Athena/src/Input/ListDatabasesInput.php
index d1440e7be4..e63702cc08 100644
--- a/src/Service/Athena/src/Input/ListDatabasesInput.php
+++ b/src/Service/Athena/src/Input/ListDatabasesInput.php
@@ -103,6 +103,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AmazonAthena.ListDatabases',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Athena/src/Input/ListNamedQueriesInput.php b/src/Service/Athena/src/Input/ListNamedQueriesInput.php
index 4a2013e8c3..e0029f3f6e 100644
--- a/src/Service/Athena/src/Input/ListNamedQueriesInput.php
+++ b/src/Service/Athena/src/Input/ListNamedQueriesInput.php
@@ -85,6 +85,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AmazonAthena.ListNamedQueries',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Athena/src/Input/ListQueryExecutionsInput.php b/src/Service/Athena/src/Input/ListQueryExecutionsInput.php
index 84222e5472..58fccc15ca 100644
--- a/src/Service/Athena/src/Input/ListQueryExecutionsInput.php
+++ b/src/Service/Athena/src/Input/ListQueryExecutionsInput.php
@@ -85,6 +85,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AmazonAthena.ListQueryExecutions',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Athena/src/Input/ListTableMetadataInput.php b/src/Service/Athena/src/Input/ListTableMetadataInput.php
index 30bbc15c9b..28046d787f 100644
--- a/src/Service/Athena/src/Input/ListTableMetadataInput.php
+++ b/src/Service/Athena/src/Input/ListTableMetadataInput.php
@@ -134,6 +134,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AmazonAthena.ListTableMetadata',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Athena/src/Input/StartCalculationExecutionRequest.php b/src/Service/Athena/src/Input/StartCalculationExecutionRequest.php
index bff3592b5e..a1e67e407b 100644
--- a/src/Service/Athena/src/Input/StartCalculationExecutionRequest.php
+++ b/src/Service/Athena/src/Input/StartCalculationExecutionRequest.php
@@ -128,6 +128,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AmazonAthena.StartCalculationExecution',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Athena/src/Input/StartQueryExecutionInput.php b/src/Service/Athena/src/Input/StartQueryExecutionInput.php
index 1e4e7cf4a6..4c8d39d599 100644
--- a/src/Service/Athena/src/Input/StartQueryExecutionInput.php
+++ b/src/Service/Athena/src/Input/StartQueryExecutionInput.php
@@ -163,6 +163,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AmazonAthena.StartQueryExecution',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Athena/src/Input/StartSessionRequest.php b/src/Service/Athena/src/Input/StartSessionRequest.php
index 62d97e4c54..fa6e8c30f8 100644
--- a/src/Service/Athena/src/Input/StartSessionRequest.php
+++ b/src/Service/Athena/src/Input/StartSessionRequest.php
@@ -142,6 +142,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AmazonAthena.StartSession',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Athena/src/Input/StopCalculationExecutionRequest.php b/src/Service/Athena/src/Input/StopCalculationExecutionRequest.php
index 49ee75a097..d586ace29a 100644
--- a/src/Service/Athena/src/Input/StopCalculationExecutionRequest.php
+++ b/src/Service/Athena/src/Input/StopCalculationExecutionRequest.php
@@ -55,6 +55,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AmazonAthena.StopCalculationExecution',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Athena/src/Input/StopQueryExecutionInput.php b/src/Service/Athena/src/Input/StopQueryExecutionInput.php
index 441045efa9..bbf7c3cea5 100644
--- a/src/Service/Athena/src/Input/StopQueryExecutionInput.php
+++ b/src/Service/Athena/src/Input/StopQueryExecutionInput.php
@@ -54,6 +54,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AmazonAthena.StopQueryExecution',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Athena/src/Input/TerminateSessionRequest.php b/src/Service/Athena/src/Input/TerminateSessionRequest.php
index 3092d3ffb1..a5760a0305 100644
--- a/src/Service/Athena/src/Input/TerminateSessionRequest.php
+++ b/src/Service/Athena/src/Input/TerminateSessionRequest.php
@@ -55,6 +55,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AmazonAthena.TerminateSession',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/CloudWatchLogs/CHANGELOG.md b/src/Service/CloudWatchLogs/CHANGELOG.md
index 23f29303ff..4195d0d96e 100644
--- a/src/Service/CloudWatchLogs/CHANGELOG.md
+++ b/src/Service/CloudWatchLogs/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## NOT RELEASED
 
+### Changed
+
+- Add `Accept: application/json` header in request to fix incompatibility with 3rd party providers
+
 ## 2.2.0
 
 ### Added
diff --git a/src/Service/CloudWatchLogs/src/Input/CreateLogGroupRequest.php b/src/Service/CloudWatchLogs/src/Input/CreateLogGroupRequest.php
index 7af8e13f1c..ae051982cd 100644
--- a/src/Service/CloudWatchLogs/src/Input/CreateLogGroupRequest.php
+++ b/src/Service/CloudWatchLogs/src/Input/CreateLogGroupRequest.php
@@ -130,6 +130,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'Logs_20140328.CreateLogGroup',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/CloudWatchLogs/src/Input/CreateLogStreamRequest.php b/src/Service/CloudWatchLogs/src/Input/CreateLogStreamRequest.php
index 3eb4bcb160..b7667cdb08 100644
--- a/src/Service/CloudWatchLogs/src/Input/CreateLogStreamRequest.php
+++ b/src/Service/CloudWatchLogs/src/Input/CreateLogStreamRequest.php
@@ -72,6 +72,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'Logs_20140328.CreateLogStream',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/CloudWatchLogs/src/Input/DescribeLogStreamsRequest.php b/src/Service/CloudWatchLogs/src/Input/DescribeLogStreamsRequest.php
index 68b453b9d8..f7a09d1ed0 100644
--- a/src/Service/CloudWatchLogs/src/Input/DescribeLogStreamsRequest.php
+++ b/src/Service/CloudWatchLogs/src/Input/DescribeLogStreamsRequest.php
@@ -163,6 +163,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'Logs_20140328.DescribeLogStreams',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/CloudWatchLogs/src/Input/FilterLogEventsRequest.php b/src/Service/CloudWatchLogs/src/Input/FilterLogEventsRequest.php
index b6c1c16d25..141c101e47 100644
--- a/src/Service/CloudWatchLogs/src/Input/FilterLogEventsRequest.php
+++ b/src/Service/CloudWatchLogs/src/Input/FilterLogEventsRequest.php
@@ -235,6 +235,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'Logs_20140328.FilterLogEvents',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/CloudWatchLogs/src/Input/PutLogEventsRequest.php b/src/Service/CloudWatchLogs/src/Input/PutLogEventsRequest.php
index d18420678c..6385000c34 100644
--- a/src/Service/CloudWatchLogs/src/Input/PutLogEventsRequest.php
+++ b/src/Service/CloudWatchLogs/src/Input/PutLogEventsRequest.php
@@ -112,6 +112,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'Logs_20140328.PutLogEvents',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/CodeBuild/CHANGELOG.md b/src/Service/CodeBuild/CHANGELOG.md
index 4d38f520a1..cd3c861790 100644
--- a/src/Service/CodeBuild/CHANGELOG.md
+++ b/src/Service/CodeBuild/CHANGELOG.md
@@ -4,6 +4,7 @@
 
 ### Changed
 
+- Add `Accept: application/json` header in request to fix incompatibility with 3rd party providers
 - AWS enhancement: Documentation updates.
 
 ## 2.4.0
diff --git a/src/Service/CodeBuild/src/Input/BatchGetBuildsInput.php b/src/Service/CodeBuild/src/Input/BatchGetBuildsInput.php
index 00094deafd..71819881d6 100644
--- a/src/Service/CodeBuild/src/Input/BatchGetBuildsInput.php
+++ b/src/Service/CodeBuild/src/Input/BatchGetBuildsInput.php
@@ -58,6 +58,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'CodeBuild_20161006.BatchGetBuilds',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/CodeBuild/src/Input/StartBuildInput.php b/src/Service/CodeBuild/src/Input/StartBuildInput.php
index e41d411831..49de10732c 100644
--- a/src/Service/CodeBuild/src/Input/StartBuildInput.php
+++ b/src/Service/CodeBuild/src/Input/StartBuildInput.php
@@ -644,6 +644,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'CodeBuild_20161006.StartBuild',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/CodeBuild/src/Input/StopBuildInput.php b/src/Service/CodeBuild/src/Input/StopBuildInput.php
index 638b191c98..ca1b29df0b 100644
--- a/src/Service/CodeBuild/src/Input/StopBuildInput.php
+++ b/src/Service/CodeBuild/src/Input/StopBuildInput.php
@@ -55,6 +55,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'CodeBuild_20161006.StopBuild',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/CodeCommit/CHANGELOG.md b/src/Service/CodeCommit/CHANGELOG.md
index 77777c3475..218c5d9b71 100644
--- a/src/Service/CodeCommit/CHANGELOG.md
+++ b/src/Service/CodeCommit/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## NOT RELEASED
 
+### Changed
+
+- Add `Accept: application/json` header in request to fix incompatibility with 3rd party providers
+
 ## 1.1.1
 
 ### Changed
diff --git a/src/Service/CodeCommit/src/Input/CreateRepositoryInput.php b/src/Service/CodeCommit/src/Input/CreateRepositoryInput.php
index 471b2c7837..299b10cbb5 100644
--- a/src/Service/CodeCommit/src/Input/CreateRepositoryInput.php
+++ b/src/Service/CodeCommit/src/Input/CreateRepositoryInput.php
@@ -124,6 +124,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'CodeCommit_20150413.CreateRepository',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/CodeCommit/src/Input/DeleteRepositoryInput.php b/src/Service/CodeCommit/src/Input/DeleteRepositoryInput.php
index 4e6abc99a6..96a6acf394 100644
--- a/src/Service/CodeCommit/src/Input/DeleteRepositoryInput.php
+++ b/src/Service/CodeCommit/src/Input/DeleteRepositoryInput.php
@@ -58,6 +58,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'CodeCommit_20150413.DeleteRepository',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/CodeCommit/src/Input/GetBlobInput.php b/src/Service/CodeCommit/src/Input/GetBlobInput.php
index 5c7a3bfc15..fdea85faeb 100644
--- a/src/Service/CodeCommit/src/Input/GetBlobInput.php
+++ b/src/Service/CodeCommit/src/Input/GetBlobInput.php
@@ -75,6 +75,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'CodeCommit_20150413.GetBlob',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/CodeCommit/src/Input/GetBranchInput.php b/src/Service/CodeCommit/src/Input/GetBranchInput.php
index a946baeb1f..7a0f1e8c19 100644
--- a/src/Service/CodeCommit/src/Input/GetBranchInput.php
+++ b/src/Service/CodeCommit/src/Input/GetBranchInput.php
@@ -70,6 +70,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'CodeCommit_20150413.GetBranch',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/CodeCommit/src/Input/GetCommitInput.php b/src/Service/CodeCommit/src/Input/GetCommitInput.php
index 54fb55b1c8..51fc6caa58 100644
--- a/src/Service/CodeCommit/src/Input/GetCommitInput.php
+++ b/src/Service/CodeCommit/src/Input/GetCommitInput.php
@@ -75,6 +75,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'CodeCommit_20150413.GetCommit',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/CodeCommit/src/Input/GetDifferencesInput.php b/src/Service/CodeCommit/src/Input/GetDifferencesInput.php
index 2e5eea92c9..36001bdf61 100644
--- a/src/Service/CodeCommit/src/Input/GetDifferencesInput.php
+++ b/src/Service/CodeCommit/src/Input/GetDifferencesInput.php
@@ -152,6 +152,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'CodeCommit_20150413.GetDifferences',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/CodeCommit/src/Input/ListRepositoriesInput.php b/src/Service/CodeCommit/src/Input/ListRepositoriesInput.php
index a03681c179..68815c01ac 100644
--- a/src/Service/CodeCommit/src/Input/ListRepositoriesInput.php
+++ b/src/Service/CodeCommit/src/Input/ListRepositoriesInput.php
@@ -96,6 +96,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'CodeCommit_20150413.ListRepositories',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/CodeCommit/src/Input/PutRepositoryTriggersInput.php b/src/Service/CodeCommit/src/Input/PutRepositoryTriggersInput.php
index 68362e42ab..e81a616f16 100644
--- a/src/Service/CodeCommit/src/Input/PutRepositoryTriggersInput.php
+++ b/src/Service/CodeCommit/src/Input/PutRepositoryTriggersInput.php
@@ -79,6 +79,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'CodeCommit_20150413.PutRepositoryTriggers',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/CodeDeploy/CHANGELOG.md b/src/Service/CodeDeploy/CHANGELOG.md
index 2cf9bb11a2..67fed0e9af 100644
--- a/src/Service/CodeDeploy/CHANGELOG.md
+++ b/src/Service/CodeDeploy/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## NOT RELEASED
 
+### Changed
+
+- Add `Accept: application/json` header in request to fix incompatibility with 3rd party providers
+
 ## 2.1.1
 
 ### Changed
diff --git a/src/Service/CodeDeploy/src/Input/CreateDeploymentInput.php b/src/Service/CodeDeploy/src/Input/CreateDeploymentInput.php
index 4611810dd3..dcafa9758d 100644
--- a/src/Service/CodeDeploy/src/Input/CreateDeploymentInput.php
+++ b/src/Service/CodeDeploy/src/Input/CreateDeploymentInput.php
@@ -254,6 +254,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'CodeDeploy_20141006.CreateDeployment',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/CodeDeploy/src/Input/GetDeploymentInput.php b/src/Service/CodeDeploy/src/Input/GetDeploymentInput.php
index 6dc02d356a..b50dbeec70 100644
--- a/src/Service/CodeDeploy/src/Input/GetDeploymentInput.php
+++ b/src/Service/CodeDeploy/src/Input/GetDeploymentInput.php
@@ -58,6 +58,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'CodeDeploy_20141006.GetDeployment',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/CodeDeploy/src/Input/PutLifecycleEventHookExecutionStatusInput.php b/src/Service/CodeDeploy/src/Input/PutLifecycleEventHookExecutionStatusInput.php
index e4f4fc69d5..1f7e099fb9 100644
--- a/src/Service/CodeDeploy/src/Input/PutLifecycleEventHookExecutionStatusInput.php
+++ b/src/Service/CodeDeploy/src/Input/PutLifecycleEventHookExecutionStatusInput.php
@@ -90,6 +90,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'CodeDeploy_20141006.PutLifecycleEventHookExecutionStatus',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/CognitoIdentityProvider/CHANGELOG.md b/src/Service/CognitoIdentityProvider/CHANGELOG.md
index f7be9d59de..98b223f7fc 100644
--- a/src/Service/CognitoIdentityProvider/CHANGELOG.md
+++ b/src/Service/CognitoIdentityProvider/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## NOT RELEASED
 
+### Changed
+
+- Add `Accept: application/json` header in request to fix incompatibility with 3rd party providers
+
 ## 1.8.0
 
 ### Added
diff --git a/src/Service/CognitoIdentityProvider/src/Input/AdminAddUserToGroupRequest.php b/src/Service/CognitoIdentityProvider/src/Input/AdminAddUserToGroupRequest.php
index d7a9296a43..012ce0c414 100644
--- a/src/Service/CognitoIdentityProvider/src/Input/AdminAddUserToGroupRequest.php
+++ b/src/Service/CognitoIdentityProvider/src/Input/AdminAddUserToGroupRequest.php
@@ -91,6 +91,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AWSCognitoIdentityProviderService.AdminAddUserToGroup',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/CognitoIdentityProvider/src/Input/AdminConfirmSignUpRequest.php b/src/Service/CognitoIdentityProvider/src/Input/AdminConfirmSignUpRequest.php
index 37e1f0a96e..c4345e14b5 100644
--- a/src/Service/CognitoIdentityProvider/src/Input/AdminConfirmSignUpRequest.php
+++ b/src/Service/CognitoIdentityProvider/src/Input/AdminConfirmSignUpRequest.php
@@ -115,6 +115,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AWSCognitoIdentityProviderService.AdminConfirmSignUp',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/CognitoIdentityProvider/src/Input/AdminCreateUserRequest.php b/src/Service/CognitoIdentityProvider/src/Input/AdminCreateUserRequest.php
index 834b80b349..bd9e355455 100644
--- a/src/Service/CognitoIdentityProvider/src/Input/AdminCreateUserRequest.php
+++ b/src/Service/CognitoIdentityProvider/src/Input/AdminCreateUserRequest.php
@@ -280,6 +280,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AWSCognitoIdentityProviderService.AdminCreateUser',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/CognitoIdentityProvider/src/Input/AdminDeleteUserRequest.php b/src/Service/CognitoIdentityProvider/src/Input/AdminDeleteUserRequest.php
index 09b45ad09e..201a537dd5 100644
--- a/src/Service/CognitoIdentityProvider/src/Input/AdminDeleteUserRequest.php
+++ b/src/Service/CognitoIdentityProvider/src/Input/AdminDeleteUserRequest.php
@@ -77,6 +77,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AWSCognitoIdentityProviderService.AdminDeleteUser',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/CognitoIdentityProvider/src/Input/AdminDisableUserRequest.php b/src/Service/CognitoIdentityProvider/src/Input/AdminDisableUserRequest.php
index fee79f5b51..c6e1eee1f3 100644
--- a/src/Service/CognitoIdentityProvider/src/Input/AdminDisableUserRequest.php
+++ b/src/Service/CognitoIdentityProvider/src/Input/AdminDisableUserRequest.php
@@ -77,6 +77,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AWSCognitoIdentityProviderService.AdminDisableUser',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/CognitoIdentityProvider/src/Input/AdminEnableUserRequest.php b/src/Service/CognitoIdentityProvider/src/Input/AdminEnableUserRequest.php
index 798bd3b238..3b6483ab07 100644
--- a/src/Service/CognitoIdentityProvider/src/Input/AdminEnableUserRequest.php
+++ b/src/Service/CognitoIdentityProvider/src/Input/AdminEnableUserRequest.php
@@ -77,6 +77,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AWSCognitoIdentityProviderService.AdminEnableUser',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/CognitoIdentityProvider/src/Input/AdminGetUserRequest.php b/src/Service/CognitoIdentityProvider/src/Input/AdminGetUserRequest.php
index 22f6d4d536..64d690ecc5 100644
--- a/src/Service/CognitoIdentityProvider/src/Input/AdminGetUserRequest.php
+++ b/src/Service/CognitoIdentityProvider/src/Input/AdminGetUserRequest.php
@@ -77,6 +77,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AWSCognitoIdentityProviderService.AdminGetUser',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/CognitoIdentityProvider/src/Input/AdminInitiateAuthRequest.php b/src/Service/CognitoIdentityProvider/src/Input/AdminInitiateAuthRequest.php
index 43b443e545..0325d89780 100644
--- a/src/Service/CognitoIdentityProvider/src/Input/AdminInitiateAuthRequest.php
+++ b/src/Service/CognitoIdentityProvider/src/Input/AdminInitiateAuthRequest.php
@@ -236,6 +236,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AWSCognitoIdentityProviderService.AdminInitiateAuth',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/CognitoIdentityProvider/src/Input/AdminRemoveUserFromGroupRequest.php b/src/Service/CognitoIdentityProvider/src/Input/AdminRemoveUserFromGroupRequest.php
index 65743c23b8..d85865cce9 100644
--- a/src/Service/CognitoIdentityProvider/src/Input/AdminRemoveUserFromGroupRequest.php
+++ b/src/Service/CognitoIdentityProvider/src/Input/AdminRemoveUserFromGroupRequest.php
@@ -91,6 +91,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AWSCognitoIdentityProviderService.AdminRemoveUserFromGroup',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/CognitoIdentityProvider/src/Input/AdminResetUserPasswordRequest.php b/src/Service/CognitoIdentityProvider/src/Input/AdminResetUserPasswordRequest.php
index cab451e2b4..e87b8402bd 100644
--- a/src/Service/CognitoIdentityProvider/src/Input/AdminResetUserPasswordRequest.php
+++ b/src/Service/CognitoIdentityProvider/src/Input/AdminResetUserPasswordRequest.php
@@ -116,6 +116,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AWSCognitoIdentityProviderService.AdminResetUserPassword',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/CognitoIdentityProvider/src/Input/AdminSetUserPasswordRequest.php b/src/Service/CognitoIdentityProvider/src/Input/AdminSetUserPasswordRequest.php
index 0de4b035e8..92030dda50 100644
--- a/src/Service/CognitoIdentityProvider/src/Input/AdminSetUserPasswordRequest.php
+++ b/src/Service/CognitoIdentityProvider/src/Input/AdminSetUserPasswordRequest.php
@@ -106,6 +106,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AWSCognitoIdentityProviderService.AdminSetUserPassword',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/CognitoIdentityProvider/src/Input/AdminUpdateUserAttributesRequest.php b/src/Service/CognitoIdentityProvider/src/Input/AdminUpdateUserAttributesRequest.php
index 215ac08ac1..0e0907c2c5 100644
--- a/src/Service/CognitoIdentityProvider/src/Input/AdminUpdateUserAttributesRequest.php
+++ b/src/Service/CognitoIdentityProvider/src/Input/AdminUpdateUserAttributesRequest.php
@@ -149,6 +149,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AWSCognitoIdentityProviderService.AdminUpdateUserAttributes',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/CognitoIdentityProvider/src/Input/AdminUserGlobalSignOutRequest.php b/src/Service/CognitoIdentityProvider/src/Input/AdminUserGlobalSignOutRequest.php
index ea16aba4fd..7eba06cf41 100644
--- a/src/Service/CognitoIdentityProvider/src/Input/AdminUserGlobalSignOutRequest.php
+++ b/src/Service/CognitoIdentityProvider/src/Input/AdminUserGlobalSignOutRequest.php
@@ -77,6 +77,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AWSCognitoIdentityProviderService.AdminUserGlobalSignOut',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/CognitoIdentityProvider/src/Input/AssociateSoftwareTokenRequest.php b/src/Service/CognitoIdentityProvider/src/Input/AssociateSoftwareTokenRequest.php
index 84d8e035af..5ec2f22fd7 100644
--- a/src/Service/CognitoIdentityProvider/src/Input/AssociateSoftwareTokenRequest.php
+++ b/src/Service/CognitoIdentityProvider/src/Input/AssociateSoftwareTokenRequest.php
@@ -68,6 +68,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AWSCognitoIdentityProviderService.AssociateSoftwareToken',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/CognitoIdentityProvider/src/Input/ChangePasswordRequest.php b/src/Service/CognitoIdentityProvider/src/Input/ChangePasswordRequest.php
index 3e85a7f0d1..57056af4a7 100644
--- a/src/Service/CognitoIdentityProvider/src/Input/ChangePasswordRequest.php
+++ b/src/Service/CognitoIdentityProvider/src/Input/ChangePasswordRequest.php
@@ -92,6 +92,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AWSCognitoIdentityProviderService.ChangePassword',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/CognitoIdentityProvider/src/Input/ConfirmForgotPasswordRequest.php b/src/Service/CognitoIdentityProvider/src/Input/ConfirmForgotPasswordRequest.php
index a80dac50a3..ca9a95dcfa 100644
--- a/src/Service/CognitoIdentityProvider/src/Input/ConfirmForgotPasswordRequest.php
+++ b/src/Service/CognitoIdentityProvider/src/Input/ConfirmForgotPasswordRequest.php
@@ -205,6 +205,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AWSCognitoIdentityProviderService.ConfirmForgotPassword',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/CognitoIdentityProvider/src/Input/ConfirmSignUpRequest.php b/src/Service/CognitoIdentityProvider/src/Input/ConfirmSignUpRequest.php
index d6ee78470a..88f827b46b 100644
--- a/src/Service/CognitoIdentityProvider/src/Input/ConfirmSignUpRequest.php
+++ b/src/Service/CognitoIdentityProvider/src/Input/ConfirmSignUpRequest.php
@@ -201,6 +201,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AWSCognitoIdentityProviderService.ConfirmSignUp',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/CognitoIdentityProvider/src/Input/CreateGroupRequest.php b/src/Service/CognitoIdentityProvider/src/Input/CreateGroupRequest.php
index 5cfa349980..dc2b3083a9 100644
--- a/src/Service/CognitoIdentityProvider/src/Input/CreateGroupRequest.php
+++ b/src/Service/CognitoIdentityProvider/src/Input/CreateGroupRequest.php
@@ -128,6 +128,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AWSCognitoIdentityProviderService.CreateGroup',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/CognitoIdentityProvider/src/Input/ForgotPasswordRequest.php b/src/Service/CognitoIdentityProvider/src/Input/ForgotPasswordRequest.php
index da31c94e8f..8e8aa5df96 100644
--- a/src/Service/CognitoIdentityProvider/src/Input/ForgotPasswordRequest.php
+++ b/src/Service/CognitoIdentityProvider/src/Input/ForgotPasswordRequest.php
@@ -166,6 +166,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AWSCognitoIdentityProviderService.ForgotPassword',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/CognitoIdentityProvider/src/Input/GetUserRequest.php b/src/Service/CognitoIdentityProvider/src/Input/GetUserRequest.php
index bc72dd3ef4..b939e924dc 100644
--- a/src/Service/CognitoIdentityProvider/src/Input/GetUserRequest.php
+++ b/src/Service/CognitoIdentityProvider/src/Input/GetUserRequest.php
@@ -58,6 +58,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AWSCognitoIdentityProviderService.GetUser',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/CognitoIdentityProvider/src/Input/InitiateAuthRequest.php b/src/Service/CognitoIdentityProvider/src/Input/InitiateAuthRequest.php
index c4ebf94505..63844e0422 100644
--- a/src/Service/CognitoIdentityProvider/src/Input/InitiateAuthRequest.php
+++ b/src/Service/CognitoIdentityProvider/src/Input/InitiateAuthRequest.php
@@ -219,6 +219,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AWSCognitoIdentityProviderService.InitiateAuth',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/CognitoIdentityProvider/src/Input/ListGroupsRequest.php b/src/Service/CognitoIdentityProvider/src/Input/ListGroupsRequest.php
index db04f0285e..efa7747e38 100644
--- a/src/Service/CognitoIdentityProvider/src/Input/ListGroupsRequest.php
+++ b/src/Service/CognitoIdentityProvider/src/Input/ListGroupsRequest.php
@@ -86,6 +86,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AWSCognitoIdentityProviderService.ListGroups',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/CognitoIdentityProvider/src/Input/ListUsersRequest.php b/src/Service/CognitoIdentityProvider/src/Input/ListUsersRequest.php
index 98f1c89ebf..2716454df7 100644
--- a/src/Service/CognitoIdentityProvider/src/Input/ListUsersRequest.php
+++ b/src/Service/CognitoIdentityProvider/src/Input/ListUsersRequest.php
@@ -171,6 +171,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AWSCognitoIdentityProviderService.ListUsers',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/CognitoIdentityProvider/src/Input/ResendConfirmationCodeRequest.php b/src/Service/CognitoIdentityProvider/src/Input/ResendConfirmationCodeRequest.php
index 5008c74553..cff1bb14ac 100644
--- a/src/Service/CognitoIdentityProvider/src/Input/ResendConfirmationCodeRequest.php
+++ b/src/Service/CognitoIdentityProvider/src/Input/ResendConfirmationCodeRequest.php
@@ -166,6 +166,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AWSCognitoIdentityProviderService.ResendConfirmationCode',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/CognitoIdentityProvider/src/Input/RespondToAuthChallengeRequest.php b/src/Service/CognitoIdentityProvider/src/Input/RespondToAuthChallengeRequest.php
index b498cf1657..9506c6ff2c 100644
--- a/src/Service/CognitoIdentityProvider/src/Input/RespondToAuthChallengeRequest.php
+++ b/src/Service/CognitoIdentityProvider/src/Input/RespondToAuthChallengeRequest.php
@@ -252,6 +252,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AWSCognitoIdentityProviderService.RespondToAuthChallenge',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/CognitoIdentityProvider/src/Input/RevokeTokenRequest.php b/src/Service/CognitoIdentityProvider/src/Input/RevokeTokenRequest.php
index d4639211e3..30aaa4888f 100644
--- a/src/Service/CognitoIdentityProvider/src/Input/RevokeTokenRequest.php
+++ b/src/Service/CognitoIdentityProvider/src/Input/RevokeTokenRequest.php
@@ -87,6 +87,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AWSCognitoIdentityProviderService.RevokeToken',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/CognitoIdentityProvider/src/Input/SetUserMFAPreferenceRequest.php b/src/Service/CognitoIdentityProvider/src/Input/SetUserMFAPreferenceRequest.php
index cbe0de585a..2350dd377a 100644
--- a/src/Service/CognitoIdentityProvider/src/Input/SetUserMFAPreferenceRequest.php
+++ b/src/Service/CognitoIdentityProvider/src/Input/SetUserMFAPreferenceRequest.php
@@ -87,6 +87,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AWSCognitoIdentityProviderService.SetUserMFAPreference',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/CognitoIdentityProvider/src/Input/SignUpRequest.php b/src/Service/CognitoIdentityProvider/src/Input/SignUpRequest.php
index 06c282d785..1fb7ab2e5b 100644
--- a/src/Service/CognitoIdentityProvider/src/Input/SignUpRequest.php
+++ b/src/Service/CognitoIdentityProvider/src/Input/SignUpRequest.php
@@ -231,6 +231,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AWSCognitoIdentityProviderService.SignUp',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/CognitoIdentityProvider/src/Input/VerifySoftwareTokenRequest.php b/src/Service/CognitoIdentityProvider/src/Input/VerifySoftwareTokenRequest.php
index 8864f908a6..11e190f442 100644
--- a/src/Service/CognitoIdentityProvider/src/Input/VerifySoftwareTokenRequest.php
+++ b/src/Service/CognitoIdentityProvider/src/Input/VerifySoftwareTokenRequest.php
@@ -102,6 +102,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AWSCognitoIdentityProviderService.VerifySoftwareToken',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Comprehend/CHANGELOG.md b/src/Service/Comprehend/CHANGELOG.md
index f71575f2aa..87c5118107 100644
--- a/src/Service/Comprehend/CHANGELOG.md
+++ b/src/Service/Comprehend/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## NOT RELEASED
 
+### Changed
+
+- Add `Accept: application/json` header in request to fix incompatibility with 3rd party providers
+
 ## 1.1.2
 
 ### Changed
diff --git a/src/Service/Comprehend/src/Input/DetectDominantLanguageRequest.php b/src/Service/Comprehend/src/Input/DetectDominantLanguageRequest.php
index 6f22755ae7..ec1fc80730 100644
--- a/src/Service/Comprehend/src/Input/DetectDominantLanguageRequest.php
+++ b/src/Service/Comprehend/src/Input/DetectDominantLanguageRequest.php
@@ -55,6 +55,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'Comprehend_20171127.DetectDominantLanguage',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/DynamoDb/CHANGELOG.md b/src/Service/DynamoDb/CHANGELOG.md
index b64ac886de..8000656d81 100644
--- a/src/Service/DynamoDb/CHANGELOG.md
+++ b/src/Service/DynamoDb/CHANGELOG.md
@@ -4,6 +4,10 @@
 
 ### Changed
 
+- Add `Accept: application/json` header in request to fix incompatibility with 3rd party providers
+
+### Changed
+
 - AWS enhancement: Documentation updates.
 
 ## 3.2.0
diff --git a/src/Service/DynamoDb/src/Input/BatchGetItemInput.php b/src/Service/DynamoDb/src/Input/BatchGetItemInput.php
index 9dbdeebed6..4840c22280 100644
--- a/src/Service/DynamoDb/src/Input/BatchGetItemInput.php
+++ b/src/Service/DynamoDb/src/Input/BatchGetItemInput.php
@@ -135,6 +135,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.0',
             'X-Amz-Target' => 'DynamoDB_20120810.BatchGetItem',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/DynamoDb/src/Input/BatchWriteItemInput.php b/src/Service/DynamoDb/src/Input/BatchWriteItemInput.php
index 95f58abff4..b4f634eea4 100644
--- a/src/Service/DynamoDb/src/Input/BatchWriteItemInput.php
+++ b/src/Service/DynamoDb/src/Input/BatchWriteItemInput.php
@@ -125,6 +125,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.0',
             'X-Amz-Target' => 'DynamoDB_20120810.BatchWriteItem',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/DynamoDb/src/Input/CreateTableInput.php b/src/Service/DynamoDb/src/Input/CreateTableInput.php
index fcd876e8f5..7fa90e23cc 100644
--- a/src/Service/DynamoDb/src/Input/CreateTableInput.php
+++ b/src/Service/DynamoDb/src/Input/CreateTableInput.php
@@ -407,6 +407,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.0',
             'X-Amz-Target' => 'DynamoDB_20120810.CreateTable',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/DynamoDb/src/Input/DeleteItemInput.php b/src/Service/DynamoDb/src/Input/DeleteItemInput.php
index d60d622350..5e096213fc 100644
--- a/src/Service/DynamoDb/src/Input/DeleteItemInput.php
+++ b/src/Service/DynamoDb/src/Input/DeleteItemInput.php
@@ -347,6 +347,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.0',
             'X-Amz-Target' => 'DynamoDB_20120810.DeleteItem',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/DynamoDb/src/Input/DeleteTableInput.php b/src/Service/DynamoDb/src/Input/DeleteTableInput.php
index ecca790142..776479aa21 100644
--- a/src/Service/DynamoDb/src/Input/DeleteTableInput.php
+++ b/src/Service/DynamoDb/src/Input/DeleteTableInput.php
@@ -58,6 +58,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.0',
             'X-Amz-Target' => 'DynamoDB_20120810.DeleteTable',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/DynamoDb/src/Input/DescribeEndpointsRequest.php b/src/Service/DynamoDb/src/Input/DescribeEndpointsRequest.php
index 31e835ae06..6c5a4730a8 100644
--- a/src/Service/DynamoDb/src/Input/DescribeEndpointsRequest.php
+++ b/src/Service/DynamoDb/src/Input/DescribeEndpointsRequest.php
@@ -37,6 +37,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.0',
             'X-Amz-Target' => 'DynamoDB_20120810.DescribeEndpoints',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/DynamoDb/src/Input/DescribeTableInput.php b/src/Service/DynamoDb/src/Input/DescribeTableInput.php
index 5bf741c085..943989742d 100644
--- a/src/Service/DynamoDb/src/Input/DescribeTableInput.php
+++ b/src/Service/DynamoDb/src/Input/DescribeTableInput.php
@@ -59,6 +59,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.0',
             'X-Amz-Target' => 'DynamoDB_20120810.DescribeTable',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/DynamoDb/src/Input/ExecuteStatementInput.php b/src/Service/DynamoDb/src/Input/ExecuteStatementInput.php
index 98ae93d790..1e8f85da64 100644
--- a/src/Service/DynamoDb/src/Input/ExecuteStatementInput.php
+++ b/src/Service/DynamoDb/src/Input/ExecuteStatementInput.php
@@ -165,6 +165,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.0',
             'X-Amz-Target' => 'DynamoDB_20120810.ExecuteStatement',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/DynamoDb/src/Input/GetItemInput.php b/src/Service/DynamoDb/src/Input/GetItemInput.php
index d4a529449e..291d5c1797 100644
--- a/src/Service/DynamoDb/src/Input/GetItemInput.php
+++ b/src/Service/DynamoDb/src/Input/GetItemInput.php
@@ -214,6 +214,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.0',
             'X-Amz-Target' => 'DynamoDB_20120810.GetItem',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/DynamoDb/src/Input/ListTablesInput.php b/src/Service/DynamoDb/src/Input/ListTablesInput.php
index b279e64765..f955dc1c89 100644
--- a/src/Service/DynamoDb/src/Input/ListTablesInput.php
+++ b/src/Service/DynamoDb/src/Input/ListTablesInput.php
@@ -71,6 +71,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.0',
             'X-Amz-Target' => 'DynamoDB_20120810.ListTables',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/DynamoDb/src/Input/PutItemInput.php b/src/Service/DynamoDb/src/Input/PutItemInput.php
index 7600077e83..be64ab239c 100644
--- a/src/Service/DynamoDb/src/Input/PutItemInput.php
+++ b/src/Service/DynamoDb/src/Input/PutItemInput.php
@@ -362,6 +362,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.0',
             'X-Amz-Target' => 'DynamoDB_20120810.PutItem',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/DynamoDb/src/Input/QueryInput.php b/src/Service/DynamoDb/src/Input/QueryInput.php
index cb8c1d72e1..dbfe4ad890 100644
--- a/src/Service/DynamoDb/src/Input/QueryInput.php
+++ b/src/Service/DynamoDb/src/Input/QueryInput.php
@@ -536,6 +536,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.0',
             'X-Amz-Target' => 'DynamoDB_20120810.Query',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/DynamoDb/src/Input/ScanInput.php b/src/Service/DynamoDb/src/Input/ScanInput.php
index 0f566b6da2..9fe1d1161b 100644
--- a/src/Service/DynamoDb/src/Input/ScanInput.php
+++ b/src/Service/DynamoDb/src/Input/ScanInput.php
@@ -476,6 +476,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.0',
             'X-Amz-Target' => 'DynamoDB_20120810.Scan',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/DynamoDb/src/Input/TransactWriteItemsInput.php b/src/Service/DynamoDb/src/Input/TransactWriteItemsInput.php
index 56193db852..90798bbe58 100644
--- a/src/Service/DynamoDb/src/Input/TransactWriteItemsInput.php
+++ b/src/Service/DynamoDb/src/Input/TransactWriteItemsInput.php
@@ -132,6 +132,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.0',
             'X-Amz-Target' => 'DynamoDB_20120810.TransactWriteItems',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/DynamoDb/src/Input/UpdateItemInput.php b/src/Service/DynamoDb/src/Input/UpdateItemInput.php
index ffa8c5461c..bc7ab61827 100644
--- a/src/Service/DynamoDb/src/Input/UpdateItemInput.php
+++ b/src/Service/DynamoDb/src/Input/UpdateItemInput.php
@@ -453,6 +453,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.0',
             'X-Amz-Target' => 'DynamoDB_20120810.UpdateItem',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/DynamoDb/src/Input/UpdateTableInput.php b/src/Service/DynamoDb/src/Input/UpdateTableInput.php
index 359f8fe19c..c4891a4bae 100644
--- a/src/Service/DynamoDb/src/Input/UpdateTableInput.php
+++ b/src/Service/DynamoDb/src/Input/UpdateTableInput.php
@@ -262,6 +262,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.0',
             'X-Amz-Target' => 'DynamoDB_20120810.UpdateTable',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/DynamoDb/src/Input/UpdateTimeToLiveInput.php b/src/Service/DynamoDb/src/Input/UpdateTimeToLiveInput.php
index da359a66d1..63951ab9bf 100644
--- a/src/Service/DynamoDb/src/Input/UpdateTimeToLiveInput.php
+++ b/src/Service/DynamoDb/src/Input/UpdateTimeToLiveInput.php
@@ -77,6 +77,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.0',
             'X-Amz-Target' => 'DynamoDB_20120810.UpdateTimeToLive',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Ecr/CHANGELOG.md b/src/Service/Ecr/CHANGELOG.md
index 1b1f04e690..12afb01616 100644
--- a/src/Service/Ecr/CHANGELOG.md
+++ b/src/Service/Ecr/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## NOT RELEASED
 
+### Changed
+
+- Add `Accept: application/json` header in request to fix incompatibility with 3rd party providers
+
 ## 1.6.0
 
 ### Added
diff --git a/src/Service/Ecr/src/Input/GetAuthorizationTokenRequest.php b/src/Service/Ecr/src/Input/GetAuthorizationTokenRequest.php
index d2a1a70a27..7f4e16f14a 100644
--- a/src/Service/Ecr/src/Input/GetAuthorizationTokenRequest.php
+++ b/src/Service/Ecr/src/Input/GetAuthorizationTokenRequest.php
@@ -60,6 +60,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AmazonEC2ContainerRegistry_V20150921.GetAuthorizationToken',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/EventBridge/CHANGELOG.md b/src/Service/EventBridge/CHANGELOG.md
index 489eb981d9..5f64f7ad26 100644
--- a/src/Service/EventBridge/CHANGELOG.md
+++ b/src/Service/EventBridge/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## NOT RELEASED
 
+### Changed
+
+- Add `Accept: application/json` header in request to fix incompatibility with 3rd party providers
+
 ## 1.5.3
 
 ### Changed
diff --git a/src/Service/EventBridge/src/Input/PutEventsRequest.php b/src/Service/EventBridge/src/Input/PutEventsRequest.php
index af1f5f2fa1..2f29eb0aec 100644
--- a/src/Service/EventBridge/src/Input/PutEventsRequest.php
+++ b/src/Service/EventBridge/src/Input/PutEventsRequest.php
@@ -78,6 +78,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AWSEvents.PutEvents',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Firehose/CHANGELOG.md b/src/Service/Firehose/CHANGELOG.md
index 80dc628e83..b44e500229 100644
--- a/src/Service/Firehose/CHANGELOG.md
+++ b/src/Service/Firehose/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## NOT RELEASED
 
+### Changed
+
+- Add `Accept: application/json` header in request to fix incompatibility with 3rd party providers
+
 ## 1.3.0
 
 ### Added
diff --git a/src/Service/Firehose/src/Input/PutRecordBatchInput.php b/src/Service/Firehose/src/Input/PutRecordBatchInput.php
index 814ae59f32..a02c10b0f4 100644
--- a/src/Service/Firehose/src/Input/PutRecordBatchInput.php
+++ b/src/Service/Firehose/src/Input/PutRecordBatchInput.php
@@ -76,6 +76,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'Firehose_20150804.PutRecordBatch',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Firehose/src/Input/PutRecordInput.php b/src/Service/Firehose/src/Input/PutRecordInput.php
index 1ed99090cd..7951cdc6a8 100644
--- a/src/Service/Firehose/src/Input/PutRecordInput.php
+++ b/src/Service/Firehose/src/Input/PutRecordInput.php
@@ -73,6 +73,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'Firehose_20150804.PutRecord',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Iot/CHANGELOG.md b/src/Service/Iot/CHANGELOG.md
index 7a3b4fb420..96130c6638 100644
--- a/src/Service/Iot/CHANGELOG.md
+++ b/src/Service/Iot/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## NOT RELEASED
 
+### Changed
+
+- Add `Accept: application/json` header in request to fix incompatibility with 3rd party providers
+
 ## 2.0.2
 
 ### Changed
diff --git a/src/Service/Iot/src/Input/AddThingToThingGroupRequest.php b/src/Service/Iot/src/Input/AddThingToThingGroupRequest.php
index 48ab25ca66..e9f848708b 100644
--- a/src/Service/Iot/src/Input/AddThingToThingGroupRequest.php
+++ b/src/Service/Iot/src/Input/AddThingToThingGroupRequest.php
@@ -111,7 +111,10 @@ public function getThingName(): ?string
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/Iot/src/Input/CreateThingGroupRequest.php b/src/Service/Iot/src/Input/CreateThingGroupRequest.php
index faaee040ae..501e79f1d2 100644
--- a/src/Service/Iot/src/Input/CreateThingGroupRequest.php
+++ b/src/Service/Iot/src/Input/CreateThingGroupRequest.php
@@ -102,7 +102,10 @@ public function getThingGroupProperties(): ?ThingGroupProperties
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/Iot/src/Input/CreateThingRequest.php b/src/Service/Iot/src/Input/CreateThingRequest.php
index 9f6220cfbe..bb9ef94aef 100644
--- a/src/Service/Iot/src/Input/CreateThingRequest.php
+++ b/src/Service/Iot/src/Input/CreateThingRequest.php
@@ -106,7 +106,10 @@ public function getThingTypeName(): ?string
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/Iot/src/Input/CreateThingTypeRequest.php b/src/Service/Iot/src/Input/CreateThingTypeRequest.php
index 4adc01b414..21a56daef0 100644
--- a/src/Service/Iot/src/Input/CreateThingTypeRequest.php
+++ b/src/Service/Iot/src/Input/CreateThingTypeRequest.php
@@ -91,7 +91,10 @@ public function getThingTypeProperties(): ?ThingTypeProperties
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/Iot/src/Input/DeleteThingGroupRequest.php b/src/Service/Iot/src/Input/DeleteThingGroupRequest.php
index 0f7af2f867..7d2031878f 100644
--- a/src/Service/Iot/src/Input/DeleteThingGroupRequest.php
+++ b/src/Service/Iot/src/Input/DeleteThingGroupRequest.php
@@ -67,7 +67,10 @@ public function getThingGroupName(): ?string
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/Iot/src/Input/DeleteThingRequest.php b/src/Service/Iot/src/Input/DeleteThingRequest.php
index 2b09e90d25..d2eecf96e5 100644
--- a/src/Service/Iot/src/Input/DeleteThingRequest.php
+++ b/src/Service/Iot/src/Input/DeleteThingRequest.php
@@ -72,7 +72,10 @@ public function getThingName(): ?string
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/Iot/src/Input/DeleteThingTypeRequest.php b/src/Service/Iot/src/Input/DeleteThingTypeRequest.php
index 33afd4636f..18ecd0dd84 100644
--- a/src/Service/Iot/src/Input/DeleteThingTypeRequest.php
+++ b/src/Service/Iot/src/Input/DeleteThingTypeRequest.php
@@ -55,7 +55,10 @@ public function getThingTypeName(): ?string
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/Iot/src/Input/ListThingGroupsForThingRequest.php b/src/Service/Iot/src/Input/ListThingGroupsForThingRequest.php
index fc3568b648..e895a5d4db 100644
--- a/src/Service/Iot/src/Input/ListThingGroupsForThingRequest.php
+++ b/src/Service/Iot/src/Input/ListThingGroupsForThingRequest.php
@@ -83,7 +83,10 @@ public function getThingName(): ?string
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/Iot/src/Input/ListThingGroupsRequest.php b/src/Service/Iot/src/Input/ListThingGroupsRequest.php
index acf394d953..7b75854d1e 100644
--- a/src/Service/Iot/src/Input/ListThingGroupsRequest.php
+++ b/src/Service/Iot/src/Input/ListThingGroupsRequest.php
@@ -110,7 +110,10 @@ public function getRecursive(): ?bool
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/Iot/src/Input/ListThingTypesRequest.php b/src/Service/Iot/src/Input/ListThingTypesRequest.php
index ca703b502f..f5d30b2b05 100644
--- a/src/Service/Iot/src/Input/ListThingTypesRequest.php
+++ b/src/Service/Iot/src/Input/ListThingTypesRequest.php
@@ -83,7 +83,10 @@ public function getThingTypeName(): ?string
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/Iot/src/Input/ListThingsInThingGroupRequest.php b/src/Service/Iot/src/Input/ListThingsInThingGroupRequest.php
index 2386bfce4f..4e0c35f0ff 100644
--- a/src/Service/Iot/src/Input/ListThingsInThingGroupRequest.php
+++ b/src/Service/Iot/src/Input/ListThingsInThingGroupRequest.php
@@ -98,7 +98,10 @@ public function getThingGroupName(): ?string
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/Iot/src/Input/ListThingsRequest.php b/src/Service/Iot/src/Input/ListThingsRequest.php
index 6a58aeccf5..01945798c8 100644
--- a/src/Service/Iot/src/Input/ListThingsRequest.php
+++ b/src/Service/Iot/src/Input/ListThingsRequest.php
@@ -132,7 +132,10 @@ public function getUsePrefixAttributeValue(): ?bool
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/IotData/CHANGELOG.md b/src/Service/IotData/CHANGELOG.md
index 942539ad57..c50d9f3702 100644
--- a/src/Service/IotData/CHANGELOG.md
+++ b/src/Service/IotData/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## NOT RELEASED
 
+### Changed
+
+- Add `Accept: application/json` header in request to fix incompatibility with 3rd party providers
+
 ## 1.1.1
 
 ### Changed
diff --git a/src/Service/IotData/src/Input/GetThingShadowRequest.php b/src/Service/IotData/src/Input/GetThingShadowRequest.php
index 3e8a59f35a..d0f2871beb 100644
--- a/src/Service/IotData/src/Input/GetThingShadowRequest.php
+++ b/src/Service/IotData/src/Input/GetThingShadowRequest.php
@@ -70,7 +70,10 @@ public function getThingName(): ?string
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/IotData/src/Input/UpdateThingShadowRequest.php b/src/Service/IotData/src/Input/UpdateThingShadowRequest.php
index 4ed7bfb682..1886bfe4ac 100644
--- a/src/Service/IotData/src/Input/UpdateThingShadowRequest.php
+++ b/src/Service/IotData/src/Input/UpdateThingShadowRequest.php
@@ -87,7 +87,10 @@ public function getThingName(): ?string
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/Kinesis/CHANGELOG.md b/src/Service/Kinesis/CHANGELOG.md
index 74f396013b..df0fbc15e1 100644
--- a/src/Service/Kinesis/CHANGELOG.md
+++ b/src/Service/Kinesis/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## NOT RELEASED
 
+### Changed
+
+- Add `Accept: application/json` header in request to fix incompatibility with 3rd party providers
+
 ## 3.0.2
 
 ### Changed
diff --git a/src/Service/Kinesis/src/Input/AddTagsToStreamInput.php b/src/Service/Kinesis/src/Input/AddTagsToStreamInput.php
index c546c4532a..2dbecd078a 100644
--- a/src/Service/Kinesis/src/Input/AddTagsToStreamInput.php
+++ b/src/Service/Kinesis/src/Input/AddTagsToStreamInput.php
@@ -91,6 +91,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'Kinesis_20131202.AddTagsToStream',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Kinesis/src/Input/CreateStreamInput.php b/src/Service/Kinesis/src/Input/CreateStreamInput.php
index fe5e7111bc..65f234cf84 100644
--- a/src/Service/Kinesis/src/Input/CreateStreamInput.php
+++ b/src/Service/Kinesis/src/Input/CreateStreamInput.php
@@ -94,6 +94,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'Kinesis_20131202.CreateStream',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Kinesis/src/Input/DecreaseStreamRetentionPeriodInput.php b/src/Service/Kinesis/src/Input/DecreaseStreamRetentionPeriodInput.php
index e2716ce998..41a7e7ab22 100644
--- a/src/Service/Kinesis/src/Input/DecreaseStreamRetentionPeriodInput.php
+++ b/src/Service/Kinesis/src/Input/DecreaseStreamRetentionPeriodInput.php
@@ -88,6 +88,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'Kinesis_20131202.DecreaseStreamRetentionPeriod',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Kinesis/src/Input/DeleteStreamInput.php b/src/Service/Kinesis/src/Input/DeleteStreamInput.php
index a3be0dee19..591e88e9fa 100644
--- a/src/Service/Kinesis/src/Input/DeleteStreamInput.php
+++ b/src/Service/Kinesis/src/Input/DeleteStreamInput.php
@@ -86,6 +86,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'Kinesis_20131202.DeleteStream',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Kinesis/src/Input/DeregisterStreamConsumerInput.php b/src/Service/Kinesis/src/Input/DeregisterStreamConsumerInput.php
index 5c986c1428..dec16df0d6 100644
--- a/src/Service/Kinesis/src/Input/DeregisterStreamConsumerInput.php
+++ b/src/Service/Kinesis/src/Input/DeregisterStreamConsumerInput.php
@@ -87,6 +87,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'Kinesis_20131202.DeregisterStreamConsumer',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Kinesis/src/Input/DescribeLimitsInput.php b/src/Service/Kinesis/src/Input/DescribeLimitsInput.php
index 8dd8d382b0..304a188693 100644
--- a/src/Service/Kinesis/src/Input/DescribeLimitsInput.php
+++ b/src/Service/Kinesis/src/Input/DescribeLimitsInput.php
@@ -37,6 +37,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'Kinesis_20131202.DescribeLimits',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Kinesis/src/Input/DescribeStreamConsumerInput.php b/src/Service/Kinesis/src/Input/DescribeStreamConsumerInput.php
index 83b894f7ad..7b1bc4a87f 100644
--- a/src/Service/Kinesis/src/Input/DescribeStreamConsumerInput.php
+++ b/src/Service/Kinesis/src/Input/DescribeStreamConsumerInput.php
@@ -85,6 +85,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'Kinesis_20131202.DescribeStreamConsumer',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Kinesis/src/Input/DescribeStreamInput.php b/src/Service/Kinesis/src/Input/DescribeStreamInput.php
index 37eb478278..16d81e8c73 100644
--- a/src/Service/Kinesis/src/Input/DescribeStreamInput.php
+++ b/src/Service/Kinesis/src/Input/DescribeStreamInput.php
@@ -107,6 +107,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'Kinesis_20131202.DescribeStream',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Kinesis/src/Input/DescribeStreamSummaryInput.php b/src/Service/Kinesis/src/Input/DescribeStreamSummaryInput.php
index 8c1a2bf74d..ac6fa5a631 100644
--- a/src/Service/Kinesis/src/Input/DescribeStreamSummaryInput.php
+++ b/src/Service/Kinesis/src/Input/DescribeStreamSummaryInput.php
@@ -67,6 +67,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'Kinesis_20131202.DescribeStreamSummary',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Kinesis/src/Input/DisableEnhancedMonitoringInput.php b/src/Service/Kinesis/src/Input/DisableEnhancedMonitoringInput.php
index a9becde777..39970a85b9 100644
--- a/src/Service/Kinesis/src/Input/DisableEnhancedMonitoringInput.php
+++ b/src/Service/Kinesis/src/Input/DisableEnhancedMonitoringInput.php
@@ -108,6 +108,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'Kinesis_20131202.DisableEnhancedMonitoring',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Kinesis/src/Input/EnableEnhancedMonitoringInput.php b/src/Service/Kinesis/src/Input/EnableEnhancedMonitoringInput.php
index ed58caa68b..026ca782be 100644
--- a/src/Service/Kinesis/src/Input/EnableEnhancedMonitoringInput.php
+++ b/src/Service/Kinesis/src/Input/EnableEnhancedMonitoringInput.php
@@ -108,6 +108,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'Kinesis_20131202.EnableEnhancedMonitoring',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Kinesis/src/Input/GetRecordsInput.php b/src/Service/Kinesis/src/Input/GetRecordsInput.php
index d6ce09aa24..ba18d4f5a1 100644
--- a/src/Service/Kinesis/src/Input/GetRecordsInput.php
+++ b/src/Service/Kinesis/src/Input/GetRecordsInput.php
@@ -90,6 +90,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'Kinesis_20131202.GetRecords',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Kinesis/src/Input/GetShardIteratorInput.php b/src/Service/Kinesis/src/Input/GetShardIteratorInput.php
index b9e72dc705..083618c823 100644
--- a/src/Service/Kinesis/src/Input/GetShardIteratorInput.php
+++ b/src/Service/Kinesis/src/Input/GetShardIteratorInput.php
@@ -156,6 +156,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'Kinesis_20131202.GetShardIterator',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Kinesis/src/Input/IncreaseStreamRetentionPeriodInput.php b/src/Service/Kinesis/src/Input/IncreaseStreamRetentionPeriodInput.php
index fee32f9e0b..9396e12d83 100644
--- a/src/Service/Kinesis/src/Input/IncreaseStreamRetentionPeriodInput.php
+++ b/src/Service/Kinesis/src/Input/IncreaseStreamRetentionPeriodInput.php
@@ -88,6 +88,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'Kinesis_20131202.IncreaseStreamRetentionPeriod',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Kinesis/src/Input/ListShardsInput.php b/src/Service/Kinesis/src/Input/ListShardsInput.php
index 378d792426..88fd2e3ff7 100644
--- a/src/Service/Kinesis/src/Input/ListShardsInput.php
+++ b/src/Service/Kinesis/src/Input/ListShardsInput.php
@@ -188,6 +188,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'Kinesis_20131202.ListShards',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Kinesis/src/Input/ListStreamConsumersInput.php b/src/Service/Kinesis/src/Input/ListStreamConsumersInput.php
index e5443746fc..216a486a6b 100644
--- a/src/Service/Kinesis/src/Input/ListStreamConsumersInput.php
+++ b/src/Service/Kinesis/src/Input/ListStreamConsumersInput.php
@@ -124,6 +124,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'Kinesis_20131202.ListStreamConsumers',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Kinesis/src/Input/ListStreamsInput.php b/src/Service/Kinesis/src/Input/ListStreamsInput.php
index 588db33b85..1bd5508d91 100644
--- a/src/Service/Kinesis/src/Input/ListStreamsInput.php
+++ b/src/Service/Kinesis/src/Input/ListStreamsInput.php
@@ -84,6 +84,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'Kinesis_20131202.ListStreams',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Kinesis/src/Input/ListTagsForStreamInput.php b/src/Service/Kinesis/src/Input/ListTagsForStreamInput.php
index d07c6c7b39..da613571e6 100644
--- a/src/Service/Kinesis/src/Input/ListTagsForStreamInput.php
+++ b/src/Service/Kinesis/src/Input/ListTagsForStreamInput.php
@@ -102,6 +102,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'Kinesis_20131202.ListTagsForStream',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Kinesis/src/Input/MergeShardsInput.php b/src/Service/Kinesis/src/Input/MergeShardsInput.php
index c13d598901..49360f018d 100644
--- a/src/Service/Kinesis/src/Input/MergeShardsInput.php
+++ b/src/Service/Kinesis/src/Input/MergeShardsInput.php
@@ -105,6 +105,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'Kinesis_20131202.MergeShards',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Kinesis/src/Input/PutRecordInput.php b/src/Service/Kinesis/src/Input/PutRecordInput.php
index 41e8069ef1..13807259b2 100644
--- a/src/Service/Kinesis/src/Input/PutRecordInput.php
+++ b/src/Service/Kinesis/src/Input/PutRecordInput.php
@@ -144,6 +144,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'Kinesis_20131202.PutRecord',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Kinesis/src/Input/PutRecordsInput.php b/src/Service/Kinesis/src/Input/PutRecordsInput.php
index cff1d94bce..a401161f1c 100644
--- a/src/Service/Kinesis/src/Input/PutRecordsInput.php
+++ b/src/Service/Kinesis/src/Input/PutRecordsInput.php
@@ -92,6 +92,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'Kinesis_20131202.PutRecords',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Kinesis/src/Input/RegisterStreamConsumerInput.php b/src/Service/Kinesis/src/Input/RegisterStreamConsumerInput.php
index b43e97e2c6..906c1be514 100644
--- a/src/Service/Kinesis/src/Input/RegisterStreamConsumerInput.php
+++ b/src/Service/Kinesis/src/Input/RegisterStreamConsumerInput.php
@@ -76,6 +76,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'Kinesis_20131202.RegisterStreamConsumer',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Kinesis/src/Input/RemoveTagsFromStreamInput.php b/src/Service/Kinesis/src/Input/RemoveTagsFromStreamInput.php
index 4fe0a82c24..70883098f2 100644
--- a/src/Service/Kinesis/src/Input/RemoveTagsFromStreamInput.php
+++ b/src/Service/Kinesis/src/Input/RemoveTagsFromStreamInput.php
@@ -91,6 +91,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'Kinesis_20131202.RemoveTagsFromStream',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Kinesis/src/Input/SplitShardInput.php b/src/Service/Kinesis/src/Input/SplitShardInput.php
index 450de98840..8a16702ad9 100644
--- a/src/Service/Kinesis/src/Input/SplitShardInput.php
+++ b/src/Service/Kinesis/src/Input/SplitShardInput.php
@@ -109,6 +109,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'Kinesis_20131202.SplitShard',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Kinesis/src/Input/StartStreamEncryptionInput.php b/src/Service/Kinesis/src/Input/StartStreamEncryptionInput.php
index 6d3f54e1b8..40af8781bd 100644
--- a/src/Service/Kinesis/src/Input/StartStreamEncryptionInput.php
+++ b/src/Service/Kinesis/src/Input/StartStreamEncryptionInput.php
@@ -115,6 +115,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'Kinesis_20131202.StartStreamEncryption',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Kinesis/src/Input/StopStreamEncryptionInput.php b/src/Service/Kinesis/src/Input/StopStreamEncryptionInput.php
index 26eeba06c3..364d4362d5 100644
--- a/src/Service/Kinesis/src/Input/StopStreamEncryptionInput.php
+++ b/src/Service/Kinesis/src/Input/StopStreamEncryptionInput.php
@@ -115,6 +115,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'Kinesis_20131202.StopStreamEncryption',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Kinesis/src/Input/UpdateShardCountInput.php b/src/Service/Kinesis/src/Input/UpdateShardCountInput.php
index 4994483712..dcc49cfc3f 100644
--- a/src/Service/Kinesis/src/Input/UpdateShardCountInput.php
+++ b/src/Service/Kinesis/src/Input/UpdateShardCountInput.php
@@ -112,6 +112,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'Kinesis_20131202.UpdateShardCount',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Kms/CHANGELOG.md b/src/Service/Kms/CHANGELOG.md
index 9678220e21..49a79d1b81 100644
--- a/src/Service/Kms/CHANGELOG.md
+++ b/src/Service/Kms/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## NOT RELEASED
 
+### Changed
+
+- Add `Accept: application/json` header in request to fix incompatibility with 3rd party providers
+
 ## 1.4.0
 
 ### Added
diff --git a/src/Service/Kms/src/Input/CreateAliasRequest.php b/src/Service/Kms/src/Input/CreateAliasRequest.php
index a58e04c885..2c231ebb8e 100644
--- a/src/Service/Kms/src/Input/CreateAliasRequest.php
+++ b/src/Service/Kms/src/Input/CreateAliasRequest.php
@@ -99,6 +99,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'TrentService.CreateAlias',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Kms/src/Input/CreateKeyRequest.php b/src/Service/Kms/src/Input/CreateKeyRequest.php
index 171a024a75..e5c1347d75 100644
--- a/src/Service/Kms/src/Input/CreateKeyRequest.php
+++ b/src/Service/Kms/src/Input/CreateKeyRequest.php
@@ -423,6 +423,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'TrentService.CreateKey',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Kms/src/Input/DecryptRequest.php b/src/Service/Kms/src/Input/DecryptRequest.php
index ee04d584ef..beff021a5c 100644
--- a/src/Service/Kms/src/Input/DecryptRequest.php
+++ b/src/Service/Kms/src/Input/DecryptRequest.php
@@ -221,6 +221,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'TrentService.Decrypt',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Kms/src/Input/EncryptRequest.php b/src/Service/Kms/src/Input/EncryptRequest.php
index f6267ea195..d32e1f073f 100644
--- a/src/Service/Kms/src/Input/EncryptRequest.php
+++ b/src/Service/Kms/src/Input/EncryptRequest.php
@@ -190,6 +190,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'TrentService.Encrypt',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Kms/src/Input/GenerateDataKeyRequest.php b/src/Service/Kms/src/Input/GenerateDataKeyRequest.php
index 51852a28f9..258b5c2b8f 100644
--- a/src/Service/Kms/src/Input/GenerateDataKeyRequest.php
+++ b/src/Service/Kms/src/Input/GenerateDataKeyRequest.php
@@ -220,6 +220,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'TrentService.GenerateDataKey',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Kms/src/Input/ListAliasesRequest.php b/src/Service/Kms/src/Input/ListAliasesRequest.php
index 480703ac97..b0d4bc145a 100644
--- a/src/Service/Kms/src/Input/ListAliasesRequest.php
+++ b/src/Service/Kms/src/Input/ListAliasesRequest.php
@@ -99,6 +99,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'TrentService.ListAliases',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Kms/src/Input/SignRequest.php b/src/Service/Kms/src/Input/SignRequest.php
index a484ecb898..b2eeb6c478 100644
--- a/src/Service/Kms/src/Input/SignRequest.php
+++ b/src/Service/Kms/src/Input/SignRequest.php
@@ -202,6 +202,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'TrentService.Sign',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Lambda/CHANGELOG.md b/src/Service/Lambda/CHANGELOG.md
index 3942d9e692..253f993e0a 100644
--- a/src/Service/Lambda/CHANGELOG.md
+++ b/src/Service/Lambda/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## NOT RELEASED
 
+### Changed
+
+- Add `Accept: application/json` header in request to fix incompatibility with 3rd party providers
+
 ## 2.5.0
 
 ### Added
diff --git a/src/Service/Lambda/src/Input/AddLayerVersionPermissionRequest.php b/src/Service/Lambda/src/Input/AddLayerVersionPermissionRequest.php
index 31eae1a41a..26a74e8f31 100644
--- a/src/Service/Lambda/src/Input/AddLayerVersionPermissionRequest.php
+++ b/src/Service/Lambda/src/Input/AddLayerVersionPermissionRequest.php
@@ -153,7 +153,10 @@ public function getVersionNumber(): ?int
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/Lambda/src/Input/DeleteFunctionRequest.php b/src/Service/Lambda/src/Input/DeleteFunctionRequest.php
index ea20d0b8ef..d3f1c5ee4e 100644
--- a/src/Service/Lambda/src/Input/DeleteFunctionRequest.php
+++ b/src/Service/Lambda/src/Input/DeleteFunctionRequest.php
@@ -76,7 +76,10 @@ public function getQualifier(): ?string
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/Lambda/src/Input/GetFunctionConfigurationRequest.php b/src/Service/Lambda/src/Input/GetFunctionConfigurationRequest.php
index 5b492ed704..2cb26f878d 100644
--- a/src/Service/Lambda/src/Input/GetFunctionConfigurationRequest.php
+++ b/src/Service/Lambda/src/Input/GetFunctionConfigurationRequest.php
@@ -76,7 +76,10 @@ public function getQualifier(): ?string
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/Lambda/src/Input/InvocationRequest.php b/src/Service/Lambda/src/Input/InvocationRequest.php
index e1c8f79e6b..bbcc7e2915 100644
--- a/src/Service/Lambda/src/Input/InvocationRequest.php
+++ b/src/Service/Lambda/src/Input/InvocationRequest.php
@@ -154,7 +154,10 @@ public function getQualifier(): ?string
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
         if (null !== $this->invocationType) {
             if (!InvocationType::exists($this->invocationType)) {
                 throw new InvalidArgument(sprintf('Invalid parameter "InvocationType" for "%s". The value "%s" is not a valid "InvocationType".', __CLASS__, $this->invocationType));
diff --git a/src/Service/Lambda/src/Input/ListFunctionsRequest.php b/src/Service/Lambda/src/Input/ListFunctionsRequest.php
index c7e44b62a0..d3e138ee65 100644
--- a/src/Service/Lambda/src/Input/ListFunctionsRequest.php
+++ b/src/Service/Lambda/src/Input/ListFunctionsRequest.php
@@ -102,7 +102,10 @@ public function getMaxItems(): ?int
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/Lambda/src/Input/ListLayerVersionsRequest.php b/src/Service/Lambda/src/Input/ListLayerVersionsRequest.php
index 6cb873bf10..30773b8d2c 100644
--- a/src/Service/Lambda/src/Input/ListLayerVersionsRequest.php
+++ b/src/Service/Lambda/src/Input/ListLayerVersionsRequest.php
@@ -126,7 +126,10 @@ public function getMaxItems(): ?int
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/Lambda/src/Input/ListVersionsByFunctionRequest.php b/src/Service/Lambda/src/Input/ListVersionsByFunctionRequest.php
index 4b1a7ee5e0..551432351a 100644
--- a/src/Service/Lambda/src/Input/ListVersionsByFunctionRequest.php
+++ b/src/Service/Lambda/src/Input/ListVersionsByFunctionRequest.php
@@ -92,7 +92,10 @@ public function getMaxItems(): ?int
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/Lambda/src/Input/PublishLayerVersionRequest.php b/src/Service/Lambda/src/Input/PublishLayerVersionRequest.php
index 5d383c39c3..7305e1da87 100644
--- a/src/Service/Lambda/src/Input/PublishLayerVersionRequest.php
+++ b/src/Service/Lambda/src/Input/PublishLayerVersionRequest.php
@@ -151,7 +151,10 @@ public function getLicenseInfo(): ?string
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/Lambda/src/Input/UpdateFunctionConfigurationRequest.php b/src/Service/Lambda/src/Input/UpdateFunctionConfigurationRequest.php
index 842ce1a32a..aab3524f31 100644
--- a/src/Service/Lambda/src/Input/UpdateFunctionConfigurationRequest.php
+++ b/src/Service/Lambda/src/Input/UpdateFunctionConfigurationRequest.php
@@ -393,7 +393,10 @@ public function getVpcConfig(): ?VpcConfig
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/LocationService/CHANGELOG.md b/src/Service/LocationService/CHANGELOG.md
index abdadb7ae0..02b0727d37 100644
--- a/src/Service/LocationService/CHANGELOG.md
+++ b/src/Service/LocationService/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## NOT RELEASED
 
+### Changed
+
+- Add `Accept: application/json` header in request to fix incompatibility with 3rd party providers
+
 ## 1.0.2
 
 ### Changed
diff --git a/src/Service/LocationService/src/Input/CalculateRouteMatrixRequest.php b/src/Service/LocationService/src/Input/CalculateRouteMatrixRequest.php
index 6a2e9e15d3..0c480319af 100644
--- a/src/Service/LocationService/src/Input/CalculateRouteMatrixRequest.php
+++ b/src/Service/LocationService/src/Input/CalculateRouteMatrixRequest.php
@@ -275,7 +275,10 @@ public function getTruckModeOptions(): ?CalculateRouteTruckModeOptions
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/LocationService/src/Input/CalculateRouteRequest.php b/src/Service/LocationService/src/Input/CalculateRouteRequest.php
index b15a23ec57..f5955f0ce3 100644
--- a/src/Service/LocationService/src/Input/CalculateRouteRequest.php
+++ b/src/Service/LocationService/src/Input/CalculateRouteRequest.php
@@ -354,7 +354,10 @@ public function getWaypointPositions(): array
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/LocationService/src/Input/SearchPlaceIndexForPositionRequest.php b/src/Service/LocationService/src/Input/SearchPlaceIndexForPositionRequest.php
index 96a5f1881c..9a50c73072 100644
--- a/src/Service/LocationService/src/Input/SearchPlaceIndexForPositionRequest.php
+++ b/src/Service/LocationService/src/Input/SearchPlaceIndexForPositionRequest.php
@@ -141,7 +141,10 @@ public function getPosition(): array
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/LocationService/src/Input/SearchPlaceIndexForTextRequest.php b/src/Service/LocationService/src/Input/SearchPlaceIndexForTextRequest.php
index 8c5201ca64..1ab05aa704 100644
--- a/src/Service/LocationService/src/Input/SearchPlaceIndexForTextRequest.php
+++ b/src/Service/LocationService/src/Input/SearchPlaceIndexForTextRequest.php
@@ -236,7 +236,10 @@ public function getText(): ?string
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/MediaConvert/CHANGELOG.md b/src/Service/MediaConvert/CHANGELOG.md
index 20a7421c5c..4bb8a561c3 100644
--- a/src/Service/MediaConvert/CHANGELOG.md
+++ b/src/Service/MediaConvert/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## NOT RELEASED
 
+### Changed
+
+- Add `Accept: application/json` header in request to fix incompatibility with 3rd party providers
+
 ## 1.2.0
 
 ### Added
diff --git a/src/Service/MediaConvert/src/Input/CancelJobRequest.php b/src/Service/MediaConvert/src/Input/CancelJobRequest.php
index 7fa1aca67a..59645c447a 100644
--- a/src/Service/MediaConvert/src/Input/CancelJobRequest.php
+++ b/src/Service/MediaConvert/src/Input/CancelJobRequest.php
@@ -55,7 +55,10 @@ public function getId(): ?string
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/MediaConvert/src/Input/CreateJobRequest.php b/src/Service/MediaConvert/src/Input/CreateJobRequest.php
index 1343d3f868..f8e856195a 100644
--- a/src/Service/MediaConvert/src/Input/CreateJobRequest.php
+++ b/src/Service/MediaConvert/src/Input/CreateJobRequest.php
@@ -286,7 +286,10 @@ public function getUserMetadata(): array
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/MediaConvert/src/Input/DescribeEndpointsRequest.php b/src/Service/MediaConvert/src/Input/DescribeEndpointsRequest.php
index aa4e4054e3..df75ddb9f8 100644
--- a/src/Service/MediaConvert/src/Input/DescribeEndpointsRequest.php
+++ b/src/Service/MediaConvert/src/Input/DescribeEndpointsRequest.php
@@ -89,7 +89,10 @@ public function getNextToken(): ?string
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/MediaConvert/src/Input/GetJobRequest.php b/src/Service/MediaConvert/src/Input/GetJobRequest.php
index 82114d23fd..74b0296d5c 100644
--- a/src/Service/MediaConvert/src/Input/GetJobRequest.php
+++ b/src/Service/MediaConvert/src/Input/GetJobRequest.php
@@ -55,7 +55,10 @@ public function getId(): ?string
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/MediaConvert/src/Input/ListJobsRequest.php b/src/Service/MediaConvert/src/Input/ListJobsRequest.php
index 151eb79605..5e4a228634 100644
--- a/src/Service/MediaConvert/src/Input/ListJobsRequest.php
+++ b/src/Service/MediaConvert/src/Input/ListJobsRequest.php
@@ -124,7 +124,10 @@ public function getStatus(): ?string
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/RdsDataService/CHANGELOG.md b/src/Service/RdsDataService/CHANGELOG.md
index bc84c1a50e..e0a48c6bc0 100644
--- a/src/Service/RdsDataService/CHANGELOG.md
+++ b/src/Service/RdsDataService/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## NOT RELEASED
 
+### Changed
+
+- Add `Accept: application/json` header in request to fix incompatibility with 3rd party providers
+
 ## 2.1.1
 
 ### Changed
diff --git a/src/Service/RdsDataService/src/Input/BatchExecuteStatementRequest.php b/src/Service/RdsDataService/src/Input/BatchExecuteStatementRequest.php
index f283f78870..dc0cd0b860 100644
--- a/src/Service/RdsDataService/src/Input/BatchExecuteStatementRequest.php
+++ b/src/Service/RdsDataService/src/Input/BatchExecuteStatementRequest.php
@@ -173,7 +173,10 @@ public function getTransactionId(): ?string
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/RdsDataService/src/Input/BeginTransactionRequest.php b/src/Service/RdsDataService/src/Input/BeginTransactionRequest.php
index d4bbaa080e..906b6cb3a5 100644
--- a/src/Service/RdsDataService/src/Input/BeginTransactionRequest.php
+++ b/src/Service/RdsDataService/src/Input/BeginTransactionRequest.php
@@ -102,7 +102,10 @@ public function getSecretArn(): ?string
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/RdsDataService/src/Input/CommitTransactionRequest.php b/src/Service/RdsDataService/src/Input/CommitTransactionRequest.php
index 69bcc47b8a..32e56d5e9f 100644
--- a/src/Service/RdsDataService/src/Input/CommitTransactionRequest.php
+++ b/src/Service/RdsDataService/src/Input/CommitTransactionRequest.php
@@ -89,7 +89,10 @@ public function getTransactionId(): ?string
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/RdsDataService/src/Input/ExecuteStatementRequest.php b/src/Service/RdsDataService/src/Input/ExecuteStatementRequest.php
index 3e5440084b..c59081a3a5 100644
--- a/src/Service/RdsDataService/src/Input/ExecuteStatementRequest.php
+++ b/src/Service/RdsDataService/src/Input/ExecuteStatementRequest.php
@@ -242,7 +242,10 @@ public function getTransactionId(): ?string
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/RdsDataService/src/Input/RollbackTransactionRequest.php b/src/Service/RdsDataService/src/Input/RollbackTransactionRequest.php
index bcca59cd0b..600a064c20 100644
--- a/src/Service/RdsDataService/src/Input/RollbackTransactionRequest.php
+++ b/src/Service/RdsDataService/src/Input/RollbackTransactionRequest.php
@@ -89,7 +89,10 @@ public function getTransactionId(): ?string
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/Rekognition/CHANGELOG.md b/src/Service/Rekognition/CHANGELOG.md
index 9a86b5db97..2708b9befc 100644
--- a/src/Service/Rekognition/CHANGELOG.md
+++ b/src/Service/Rekognition/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## NOT RELEASED
 
+### Changed
+
+- Add `Accept: application/json` header in request to fix incompatibility with 3rd party providers
+
 ## 1.2.0
 
 ### Added
diff --git a/src/Service/Rekognition/src/Input/CreateCollectionRequest.php b/src/Service/Rekognition/src/Input/CreateCollectionRequest.php
index 1f55797559..96344c0335 100644
--- a/src/Service/Rekognition/src/Input/CreateCollectionRequest.php
+++ b/src/Service/Rekognition/src/Input/CreateCollectionRequest.php
@@ -73,6 +73,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'RekognitionService.CreateCollection',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Rekognition/src/Input/CreateProjectRequest.php b/src/Service/Rekognition/src/Input/CreateProjectRequest.php
index 7465bbfcc2..85b4bf7cb0 100644
--- a/src/Service/Rekognition/src/Input/CreateProjectRequest.php
+++ b/src/Service/Rekognition/src/Input/CreateProjectRequest.php
@@ -94,6 +94,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'RekognitionService.CreateProject',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Rekognition/src/Input/DeleteCollectionRequest.php b/src/Service/Rekognition/src/Input/DeleteCollectionRequest.php
index 666bca14b4..fcae0f07e0 100644
--- a/src/Service/Rekognition/src/Input/DeleteCollectionRequest.php
+++ b/src/Service/Rekognition/src/Input/DeleteCollectionRequest.php
@@ -55,6 +55,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'RekognitionService.DeleteCollection',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Rekognition/src/Input/DeleteProjectRequest.php b/src/Service/Rekognition/src/Input/DeleteProjectRequest.php
index 37c7daecc6..833317cfe6 100644
--- a/src/Service/Rekognition/src/Input/DeleteProjectRequest.php
+++ b/src/Service/Rekognition/src/Input/DeleteProjectRequest.php
@@ -55,6 +55,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'RekognitionService.DeleteProject',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Rekognition/src/Input/DetectFacesRequest.php b/src/Service/Rekognition/src/Input/DetectFacesRequest.php
index 764b23559e..0883f0c6c2 100644
--- a/src/Service/Rekognition/src/Input/DetectFacesRequest.php
+++ b/src/Service/Rekognition/src/Input/DetectFacesRequest.php
@@ -88,6 +88,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'RekognitionService.DetectFaces',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Rekognition/src/Input/DetectModerationLabelsRequest.php b/src/Service/Rekognition/src/Input/DetectModerationLabelsRequest.php
index cf0b3df58c..9bad6e58f9 100644
--- a/src/Service/Rekognition/src/Input/DetectModerationLabelsRequest.php
+++ b/src/Service/Rekognition/src/Input/DetectModerationLabelsRequest.php
@@ -111,6 +111,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'RekognitionService.DetectModerationLabels',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Rekognition/src/Input/GetCelebrityInfoRequest.php b/src/Service/Rekognition/src/Input/GetCelebrityInfoRequest.php
index b718c0ca4e..f3f55fbb55 100644
--- a/src/Service/Rekognition/src/Input/GetCelebrityInfoRequest.php
+++ b/src/Service/Rekognition/src/Input/GetCelebrityInfoRequest.php
@@ -56,6 +56,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'RekognitionService.GetCelebrityInfo',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Rekognition/src/Input/IndexFacesRequest.php b/src/Service/Rekognition/src/Input/IndexFacesRequest.php
index 2e9e7a4fe8..dfb28f3447 100644
--- a/src/Service/Rekognition/src/Input/IndexFacesRequest.php
+++ b/src/Service/Rekognition/src/Input/IndexFacesRequest.php
@@ -169,6 +169,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'RekognitionService.IndexFaces',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Rekognition/src/Input/ListCollectionsRequest.php b/src/Service/Rekognition/src/Input/ListCollectionsRequest.php
index 03a88c0e66..25e784bf51 100644
--- a/src/Service/Rekognition/src/Input/ListCollectionsRequest.php
+++ b/src/Service/Rekognition/src/Input/ListCollectionsRequest.php
@@ -67,6 +67,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'RekognitionService.ListCollections',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Rekognition/src/Input/RecognizeCelebritiesRequest.php b/src/Service/Rekognition/src/Input/RecognizeCelebritiesRequest.php
index 67f424b39a..8fe7641c12 100644
--- a/src/Service/Rekognition/src/Input/RecognizeCelebritiesRequest.php
+++ b/src/Service/Rekognition/src/Input/RecognizeCelebritiesRequest.php
@@ -60,6 +60,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'RekognitionService.RecognizeCelebrities',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Rekognition/src/Input/SearchFacesByImageRequest.php b/src/Service/Rekognition/src/Input/SearchFacesByImageRequest.php
index 7b3fb1b5a3..ae06f784b9 100644
--- a/src/Service/Rekognition/src/Input/SearchFacesByImageRequest.php
+++ b/src/Service/Rekognition/src/Input/SearchFacesByImageRequest.php
@@ -135,6 +135,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'RekognitionService.SearchFacesByImage',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Scheduler/CHANGELOG.md b/src/Service/Scheduler/CHANGELOG.md
index 749422da3e..773965e930 100644
--- a/src/Service/Scheduler/CHANGELOG.md
+++ b/src/Service/Scheduler/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## NOT RELEASED
 
+### Changed
+
+- Add `Accept: application/json` header in request to fix incompatibility with 3rd party providers
+
 ## 1.1.1
 
 ### Changed
diff --git a/src/Service/Scheduler/src/Input/CreateScheduleGroupInput.php b/src/Service/Scheduler/src/Input/CreateScheduleGroupInput.php
index 6a5238f091..5354d058b7 100644
--- a/src/Service/Scheduler/src/Input/CreateScheduleGroupInput.php
+++ b/src/Service/Scheduler/src/Input/CreateScheduleGroupInput.php
@@ -87,7 +87,10 @@ public function getTags(): array
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/Scheduler/src/Input/CreateScheduleInput.php b/src/Service/Scheduler/src/Input/CreateScheduleInput.php
index 90162768c2..15728bfef7 100644
--- a/src/Service/Scheduler/src/Input/CreateScheduleInput.php
+++ b/src/Service/Scheduler/src/Input/CreateScheduleInput.php
@@ -276,7 +276,10 @@ public function getTarget(): ?Target
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/Scheduler/src/Input/DeleteScheduleGroupInput.php b/src/Service/Scheduler/src/Input/DeleteScheduleGroupInput.php
index 558f686476..8b71b8af43 100644
--- a/src/Service/Scheduler/src/Input/DeleteScheduleGroupInput.php
+++ b/src/Service/Scheduler/src/Input/DeleteScheduleGroupInput.php
@@ -68,7 +68,10 @@ public function getName(): ?string
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/Scheduler/src/Input/DeleteScheduleInput.php b/src/Service/Scheduler/src/Input/DeleteScheduleInput.php
index a1b3593a84..84cdee0181 100644
--- a/src/Service/Scheduler/src/Input/DeleteScheduleInput.php
+++ b/src/Service/Scheduler/src/Input/DeleteScheduleInput.php
@@ -83,7 +83,10 @@ public function getName(): ?string
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/Scheduler/src/Input/GetScheduleGroupInput.php b/src/Service/Scheduler/src/Input/GetScheduleGroupInput.php
index b6551c164b..9a5b2a0c53 100644
--- a/src/Service/Scheduler/src/Input/GetScheduleGroupInput.php
+++ b/src/Service/Scheduler/src/Input/GetScheduleGroupInput.php
@@ -52,7 +52,10 @@ public function getName(): ?string
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/Scheduler/src/Input/GetScheduleInput.php b/src/Service/Scheduler/src/Input/GetScheduleInput.php
index d32a86c117..37761a0ce8 100644
--- a/src/Service/Scheduler/src/Input/GetScheduleInput.php
+++ b/src/Service/Scheduler/src/Input/GetScheduleInput.php
@@ -68,7 +68,10 @@ public function getName(): ?string
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/Scheduler/src/Input/ListScheduleGroupsInput.php b/src/Service/Scheduler/src/Input/ListScheduleGroupsInput.php
index 18b381b9fc..b77abfa610 100644
--- a/src/Service/Scheduler/src/Input/ListScheduleGroupsInput.php
+++ b/src/Service/Scheduler/src/Input/ListScheduleGroupsInput.php
@@ -80,7 +80,10 @@ public function getNextToken(): ?string
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/Scheduler/src/Input/ListSchedulesInput.php b/src/Service/Scheduler/src/Input/ListSchedulesInput.php
index ac8c7b7309..563c983d9a 100644
--- a/src/Service/Scheduler/src/Input/ListSchedulesInput.php
+++ b/src/Service/Scheduler/src/Input/ListSchedulesInput.php
@@ -115,7 +115,10 @@ public function getState(): ?string
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/Scheduler/src/Input/UpdateScheduleInput.php b/src/Service/Scheduler/src/Input/UpdateScheduleInput.php
index 6e59d07c28..522d7c4d38 100644
--- a/src/Service/Scheduler/src/Input/UpdateScheduleInput.php
+++ b/src/Service/Scheduler/src/Input/UpdateScheduleInput.php
@@ -278,7 +278,10 @@ public function getTarget(): ?Target
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/SecretsManager/CHANGELOG.md b/src/Service/SecretsManager/CHANGELOG.md
index 622f3935ce..310c54d75f 100644
--- a/src/Service/SecretsManager/CHANGELOG.md
+++ b/src/Service/SecretsManager/CHANGELOG.md
@@ -4,6 +4,10 @@
 
 ### Changed
 
+- Add `Accept: application/json` header in request to fix incompatibility with 3rd party providers
+
+### Changed
+
 - AWS enhancement: Documentation updates.
 
 ## 2.2.2
diff --git a/src/Service/SecretsManager/src/Input/CreateSecretRequest.php b/src/Service/SecretsManager/src/Input/CreateSecretRequest.php
index 107b8021e4..456ef9714b 100644
--- a/src/Service/SecretsManager/src/Input/CreateSecretRequest.php
+++ b/src/Service/SecretsManager/src/Input/CreateSecretRequest.php
@@ -261,6 +261,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'secretsmanager.CreateSecret',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/SecretsManager/src/Input/DeleteSecretRequest.php b/src/Service/SecretsManager/src/Input/DeleteSecretRequest.php
index d07f5caf57..02dc961028 100644
--- a/src/Service/SecretsManager/src/Input/DeleteSecretRequest.php
+++ b/src/Service/SecretsManager/src/Input/DeleteSecretRequest.php
@@ -106,6 +106,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'secretsmanager.DeleteSecret',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/SecretsManager/src/Input/GetSecretValueRequest.php b/src/Service/SecretsManager/src/Input/GetSecretValueRequest.php
index 28ab3f8442..1793896670 100644
--- a/src/Service/SecretsManager/src/Input/GetSecretValueRequest.php
+++ b/src/Service/SecretsManager/src/Input/GetSecretValueRequest.php
@@ -100,6 +100,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'secretsmanager.GetSecretValue',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/SecretsManager/src/Input/ListSecretsRequest.php b/src/Service/SecretsManager/src/Input/ListSecretsRequest.php
index c7ddd42f28..3596e1ccf1 100644
--- a/src/Service/SecretsManager/src/Input/ListSecretsRequest.php
+++ b/src/Service/SecretsManager/src/Input/ListSecretsRequest.php
@@ -126,6 +126,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'secretsmanager.ListSecrets',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/SecretsManager/src/Input/PutSecretValueRequest.php b/src/Service/SecretsManager/src/Input/PutSecretValueRequest.php
index eb4ad3c82d..05aeabed47 100644
--- a/src/Service/SecretsManager/src/Input/PutSecretValueRequest.php
+++ b/src/Service/SecretsManager/src/Input/PutSecretValueRequest.php
@@ -166,6 +166,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'secretsmanager.PutSecretValue',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/SecretsManager/src/Input/UpdateSecretRequest.php b/src/Service/SecretsManager/src/Input/UpdateSecretRequest.php
index 08160f8940..7937fc62e1 100644
--- a/src/Service/SecretsManager/src/Input/UpdateSecretRequest.php
+++ b/src/Service/SecretsManager/src/Input/UpdateSecretRequest.php
@@ -176,6 +176,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'secretsmanager.UpdateSecret',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Ses/CHANGELOG.md b/src/Service/Ses/CHANGELOG.md
index 0eb15ea4ef..f53b1480ac 100644
--- a/src/Service/Ses/CHANGELOG.md
+++ b/src/Service/Ses/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## NOT RELEASED
 
+### Changed
+
+- Add `Accept: application/json` header in request to fix incompatibility with 3rd party providers
+
 ## 1.8.0
 
 ### Added
diff --git a/src/Service/Ses/src/Input/SendEmailRequest.php b/src/Service/Ses/src/Input/SendEmailRequest.php
index a7b642d275..d6d8f87865 100644
--- a/src/Service/Ses/src/Input/SendEmailRequest.php
+++ b/src/Service/Ses/src/Input/SendEmailRequest.php
@@ -234,7 +234,10 @@ public function getReplyToAddresses(): array
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];
diff --git a/src/Service/Sqs/CHANGELOG.md b/src/Service/Sqs/CHANGELOG.md
index bc423d1ac0..8538e6f16f 100644
--- a/src/Service/Sqs/CHANGELOG.md
+++ b/src/Service/Sqs/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## NOT RELEASED
 
+### Changed
+
+- Add `Accept: application/json` header in request to fix incompatibility with 3rd party providers
+
 ## 2.1.0
 
 ### Added
diff --git a/src/Service/Sqs/src/Input/ChangeMessageVisibilityBatchRequest.php b/src/Service/Sqs/src/Input/ChangeMessageVisibilityBatchRequest.php
index 41becad1f5..10a1f3f5b4 100644
--- a/src/Service/Sqs/src/Input/ChangeMessageVisibilityBatchRequest.php
+++ b/src/Service/Sqs/src/Input/ChangeMessageVisibilityBatchRequest.php
@@ -78,6 +78,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.0',
             'X-Amz-Target' => 'AmazonSQS.ChangeMessageVisibilityBatch',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Sqs/src/Input/ChangeMessageVisibilityRequest.php b/src/Service/Sqs/src/Input/ChangeMessageVisibilityRequest.php
index 07b14bacea..85f1ec54e9 100644
--- a/src/Service/Sqs/src/Input/ChangeMessageVisibilityRequest.php
+++ b/src/Service/Sqs/src/Input/ChangeMessageVisibilityRequest.php
@@ -92,6 +92,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.0',
             'X-Amz-Target' => 'AmazonSQS.ChangeMessageVisibility',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Sqs/src/Input/CreateQueueRequest.php b/src/Service/Sqs/src/Input/CreateQueueRequest.php
index 8a4dd6be06..d334e893b2 100644
--- a/src/Service/Sqs/src/Input/CreateQueueRequest.php
+++ b/src/Service/Sqs/src/Input/CreateQueueRequest.php
@@ -247,6 +247,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.0',
             'X-Amz-Target' => 'AmazonSQS.CreateQueue',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Sqs/src/Input/DeleteMessageBatchRequest.php b/src/Service/Sqs/src/Input/DeleteMessageBatchRequest.php
index cc7421923b..5daf55156e 100644
--- a/src/Service/Sqs/src/Input/DeleteMessageBatchRequest.php
+++ b/src/Service/Sqs/src/Input/DeleteMessageBatchRequest.php
@@ -78,6 +78,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.0',
             'X-Amz-Target' => 'AmazonSQS.DeleteMessageBatch',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Sqs/src/Input/DeleteMessageRequest.php b/src/Service/Sqs/src/Input/DeleteMessageRequest.php
index d9a46a27a4..89a1e74e29 100644
--- a/src/Service/Sqs/src/Input/DeleteMessageRequest.php
+++ b/src/Service/Sqs/src/Input/DeleteMessageRequest.php
@@ -74,6 +74,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.0',
             'X-Amz-Target' => 'AmazonSQS.DeleteMessage',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Sqs/src/Input/DeleteQueueRequest.php b/src/Service/Sqs/src/Input/DeleteQueueRequest.php
index c9c11007b4..dfd03a3389 100644
--- a/src/Service/Sqs/src/Input/DeleteQueueRequest.php
+++ b/src/Service/Sqs/src/Input/DeleteQueueRequest.php
@@ -57,6 +57,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.0',
             'X-Amz-Target' => 'AmazonSQS.DeleteQueue',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Sqs/src/Input/GetQueueAttributesRequest.php b/src/Service/Sqs/src/Input/GetQueueAttributesRequest.php
index bc3c20b7ec..5b66c6209a 100644
--- a/src/Service/Sqs/src/Input/GetQueueAttributesRequest.php
+++ b/src/Service/Sqs/src/Input/GetQueueAttributesRequest.php
@@ -201,6 +201,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.0',
             'X-Amz-Target' => 'AmazonSQS.GetQueueAttributes',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Sqs/src/Input/GetQueueUrlRequest.php b/src/Service/Sqs/src/Input/GetQueueUrlRequest.php
index 62bca372a7..74c12d7057 100644
--- a/src/Service/Sqs/src/Input/GetQueueUrlRequest.php
+++ b/src/Service/Sqs/src/Input/GetQueueUrlRequest.php
@@ -73,6 +73,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.0',
             'X-Amz-Target' => 'AmazonSQS.GetQueueUrl',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Sqs/src/Input/ListQueuesRequest.php b/src/Service/Sqs/src/Input/ListQueuesRequest.php
index 46cc9fe69e..e30e5407a3 100644
--- a/src/Service/Sqs/src/Input/ListQueuesRequest.php
+++ b/src/Service/Sqs/src/Input/ListQueuesRequest.php
@@ -86,6 +86,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.0',
             'X-Amz-Target' => 'AmazonSQS.ListQueues',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Sqs/src/Input/PurgeQueueRequest.php b/src/Service/Sqs/src/Input/PurgeQueueRequest.php
index c5df1877c8..e104541456 100644
--- a/src/Service/Sqs/src/Input/PurgeQueueRequest.php
+++ b/src/Service/Sqs/src/Input/PurgeQueueRequest.php
@@ -57,6 +57,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.0',
             'X-Amz-Target' => 'AmazonSQS.PurgeQueue',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Sqs/src/Input/ReceiveMessageRequest.php b/src/Service/Sqs/src/Input/ReceiveMessageRequest.php
index 7bf39cb516..876c855b53 100644
--- a/src/Service/Sqs/src/Input/ReceiveMessageRequest.php
+++ b/src/Service/Sqs/src/Input/ReceiveMessageRequest.php
@@ -256,6 +256,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.0',
             'X-Amz-Target' => 'AmazonSQS.ReceiveMessage',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Sqs/src/Input/SendMessageBatchRequest.php b/src/Service/Sqs/src/Input/SendMessageBatchRequest.php
index a3a7280fe7..3738d02dba 100644
--- a/src/Service/Sqs/src/Input/SendMessageBatchRequest.php
+++ b/src/Service/Sqs/src/Input/SendMessageBatchRequest.php
@@ -78,6 +78,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.0',
             'X-Amz-Target' => 'AmazonSQS.SendMessageBatch',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Sqs/src/Input/SendMessageRequest.php b/src/Service/Sqs/src/Input/SendMessageRequest.php
index ea521ac78e..a9ff562343 100644
--- a/src/Service/Sqs/src/Input/SendMessageRequest.php
+++ b/src/Service/Sqs/src/Input/SendMessageRequest.php
@@ -251,6 +251,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.0',
             'X-Amz-Target' => 'AmazonSQS.SendMessage',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Ssm/CHANGELOG.md b/src/Service/Ssm/CHANGELOG.md
index 0ee4d7728b..7e7d8a0763 100644
--- a/src/Service/Ssm/CHANGELOG.md
+++ b/src/Service/Ssm/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## NOT RELEASED
 
+### Changed
+
+- Add `Accept: application/json` header in request to fix incompatibility with 3rd party providers
+
 ## 2.1.2
 
 ### Changed
diff --git a/src/Service/Ssm/src/Input/DeleteParameterRequest.php b/src/Service/Ssm/src/Input/DeleteParameterRequest.php
index a5c4e93d2b..722eba0037 100644
--- a/src/Service/Ssm/src/Input/DeleteParameterRequest.php
+++ b/src/Service/Ssm/src/Input/DeleteParameterRequest.php
@@ -57,6 +57,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AmazonSSM.DeleteParameter',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Ssm/src/Input/DeleteParametersRequest.php b/src/Service/Ssm/src/Input/DeleteParametersRequest.php
index 75153e476a..bc740fda01 100644
--- a/src/Service/Ssm/src/Input/DeleteParametersRequest.php
+++ b/src/Service/Ssm/src/Input/DeleteParametersRequest.php
@@ -61,6 +61,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AmazonSSM.DeleteParameters',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Ssm/src/Input/GetParameterRequest.php b/src/Service/Ssm/src/Input/GetParameterRequest.php
index 7e4af5b9c7..c7ffd4b9cc 100644
--- a/src/Service/Ssm/src/Input/GetParameterRequest.php
+++ b/src/Service/Ssm/src/Input/GetParameterRequest.php
@@ -79,6 +79,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AmazonSSM.GetParameter',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Ssm/src/Input/GetParametersByPathRequest.php b/src/Service/Ssm/src/Input/GetParametersByPathRequest.php
index 385ef74f66..88b3e8ee56 100644
--- a/src/Service/Ssm/src/Input/GetParametersByPathRequest.php
+++ b/src/Service/Ssm/src/Input/GetParametersByPathRequest.php
@@ -148,6 +148,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AmazonSSM.GetParametersByPath',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Ssm/src/Input/GetParametersRequest.php b/src/Service/Ssm/src/Input/GetParametersRequest.php
index f15befa884..e390e4dfb7 100644
--- a/src/Service/Ssm/src/Input/GetParametersRequest.php
+++ b/src/Service/Ssm/src/Input/GetParametersRequest.php
@@ -84,6 +84,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AmazonSSM.GetParameters',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Ssm/src/Input/PutParameterRequest.php b/src/Service/Ssm/src/Input/PutParameterRequest.php
index 5605507db7..e4ec8c2416 100644
--- a/src/Service/Ssm/src/Input/PutParameterRequest.php
+++ b/src/Service/Ssm/src/Input/PutParameterRequest.php
@@ -367,6 +367,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AmazonSSM.PutParameter',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Sso/CHANGELOG.md b/src/Service/Sso/CHANGELOG.md
index 5d11bc6e36..f36e07f7a6 100644
--- a/src/Service/Sso/CHANGELOG.md
+++ b/src/Service/Sso/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## NOT RELEASED
 
+### Changed
+
+- Add `Accept: application/json` header in request to fix incompatibility with 3rd party providers
+
 ## 1.2.0
 
 ### Added
diff --git a/src/Service/Sso/src/Input/GetRoleCredentialsRequest.php b/src/Service/Sso/src/Input/GetRoleCredentialsRequest.php
index f69b4f880e..2112a0c530 100644
--- a/src/Service/Sso/src/Input/GetRoleCredentialsRequest.php
+++ b/src/Service/Sso/src/Input/GetRoleCredentialsRequest.php
@@ -89,7 +89,10 @@ public function getRoleName(): ?string
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
         if (null === $v = $this->accessToken) {
             throw new InvalidArgument(sprintf('Missing parameter "accessToken" for "%s". The value cannot be null.', __CLASS__));
         }
diff --git a/src/Service/StepFunctions/CHANGELOG.md b/src/Service/StepFunctions/CHANGELOG.md
index ec034c837f..03a685b267 100644
--- a/src/Service/StepFunctions/CHANGELOG.md
+++ b/src/Service/StepFunctions/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## NOT RELEASED
 
+### Changed
+
+- Add `Accept: application/json` header in request to fix incompatibility with 3rd party providers
+
 ## 1.2.2
 
 ### Changed
diff --git a/src/Service/StepFunctions/src/Input/SendTaskFailureInput.php b/src/Service/StepFunctions/src/Input/SendTaskFailureInput.php
index c05625b40a..93f5f16aa6 100644
--- a/src/Service/StepFunctions/src/Input/SendTaskFailureInput.php
+++ b/src/Service/StepFunctions/src/Input/SendTaskFailureInput.php
@@ -88,6 +88,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.0',
             'X-Amz-Target' => 'AWSStepFunctions.SendTaskFailure',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/StepFunctions/src/Input/SendTaskHeartbeatInput.php b/src/Service/StepFunctions/src/Input/SendTaskHeartbeatInput.php
index 8e94031b4c..a0c10bdb44 100644
--- a/src/Service/StepFunctions/src/Input/SendTaskHeartbeatInput.php
+++ b/src/Service/StepFunctions/src/Input/SendTaskHeartbeatInput.php
@@ -58,6 +58,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.0',
             'X-Amz-Target' => 'AWSStepFunctions.SendTaskHeartbeat',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/StepFunctions/src/Input/SendTaskSuccessInput.php b/src/Service/StepFunctions/src/Input/SendTaskSuccessInput.php
index 5ac24e524c..da65b46037 100644
--- a/src/Service/StepFunctions/src/Input/SendTaskSuccessInput.php
+++ b/src/Service/StepFunctions/src/Input/SendTaskSuccessInput.php
@@ -76,6 +76,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.0',
             'X-Amz-Target' => 'AWSStepFunctions.SendTaskSuccess',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/StepFunctions/src/Input/StartExecutionInput.php b/src/Service/StepFunctions/src/Input/StartExecutionInput.php
index b71de01518..5c5efd4bc5 100644
--- a/src/Service/StepFunctions/src/Input/StartExecutionInput.php
+++ b/src/Service/StepFunctions/src/Input/StartExecutionInput.php
@@ -147,6 +147,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.0',
             'X-Amz-Target' => 'AWSStepFunctions.StartExecution',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/StepFunctions/src/Input/StopExecutionInput.php b/src/Service/StepFunctions/src/Input/StopExecutionInput.php
index 433fc24e33..f81cc71cf4 100644
--- a/src/Service/StepFunctions/src/Input/StopExecutionInput.php
+++ b/src/Service/StepFunctions/src/Input/StopExecutionInput.php
@@ -85,6 +85,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.0',
             'X-Amz-Target' => 'AWSStepFunctions.StopExecution',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/TimestreamQuery/CHANGELOG.md b/src/Service/TimestreamQuery/CHANGELOG.md
index e5c50783c4..73824195fb 100644
--- a/src/Service/TimestreamQuery/CHANGELOG.md
+++ b/src/Service/TimestreamQuery/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## NOT RELEASED
 
+### Changed
+
+- Add `Accept: application/json` header in request to fix incompatibility with 3rd party providers
+
 ## 2.0.2
 
 ### Changed
diff --git a/src/Service/TimestreamQuery/src/Input/CancelQueryRequest.php b/src/Service/TimestreamQuery/src/Input/CancelQueryRequest.php
index d6ad545c40..d8433cf3d9 100644
--- a/src/Service/TimestreamQuery/src/Input/CancelQueryRequest.php
+++ b/src/Service/TimestreamQuery/src/Input/CancelQueryRequest.php
@@ -55,6 +55,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.0',
             'X-Amz-Target' => 'Timestream_20181101.CancelQuery',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/TimestreamQuery/src/Input/DescribeEndpointsRequest.php b/src/Service/TimestreamQuery/src/Input/DescribeEndpointsRequest.php
index b59c5493f0..3148cd68d8 100644
--- a/src/Service/TimestreamQuery/src/Input/DescribeEndpointsRequest.php
+++ b/src/Service/TimestreamQuery/src/Input/DescribeEndpointsRequest.php
@@ -37,6 +37,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.0',
             'X-Amz-Target' => 'Timestream_20181101.DescribeEndpoints',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/TimestreamQuery/src/Input/PrepareQueryRequest.php b/src/Service/TimestreamQuery/src/Input/PrepareQueryRequest.php
index f758872543..aa37799f49 100644
--- a/src/Service/TimestreamQuery/src/Input/PrepareQueryRequest.php
+++ b/src/Service/TimestreamQuery/src/Input/PrepareQueryRequest.php
@@ -72,6 +72,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.0',
             'X-Amz-Target' => 'Timestream_20181101.PrepareQuery',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/TimestreamQuery/src/Input/QueryRequest.php b/src/Service/TimestreamQuery/src/Input/QueryRequest.php
index c1377e5c0e..874a2bfcf2 100644
--- a/src/Service/TimestreamQuery/src/Input/QueryRequest.php
+++ b/src/Service/TimestreamQuery/src/Input/QueryRequest.php
@@ -139,6 +139,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.0',
             'X-Amz-Target' => 'Timestream_20181101.Query',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/TimestreamWrite/CHANGELOG.md b/src/Service/TimestreamWrite/CHANGELOG.md
index a25eb1603f..a8aeee581e 100644
--- a/src/Service/TimestreamWrite/CHANGELOG.md
+++ b/src/Service/TimestreamWrite/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## NOT RELEASED
 
+### Changed
+
+- Add `Accept: application/json` header in request to fix incompatibility with 3rd party providers
+
 ## 2.0.2
 
 ### Changed
diff --git a/src/Service/TimestreamWrite/src/Input/DescribeEndpointsRequest.php b/src/Service/TimestreamWrite/src/Input/DescribeEndpointsRequest.php
index 4732dd0c0e..11f3f6809c 100644
--- a/src/Service/TimestreamWrite/src/Input/DescribeEndpointsRequest.php
+++ b/src/Service/TimestreamWrite/src/Input/DescribeEndpointsRequest.php
@@ -37,6 +37,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.0',
             'X-Amz-Target' => 'Timestream_20181101.DescribeEndpoints',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/TimestreamWrite/src/Input/WriteRecordsRequest.php b/src/Service/TimestreamWrite/src/Input/WriteRecordsRequest.php
index d9fc9b73dc..4431bfcca3 100644
--- a/src/Service/TimestreamWrite/src/Input/WriteRecordsRequest.php
+++ b/src/Service/TimestreamWrite/src/Input/WriteRecordsRequest.php
@@ -113,6 +113,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.0',
             'X-Amz-Target' => 'Timestream_20181101.WriteRecords',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/Translate/CHANGELOG.md b/src/Service/Translate/CHANGELOG.md
index f548615c19..15a30f722d 100644
--- a/src/Service/Translate/CHANGELOG.md
+++ b/src/Service/Translate/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## NOT RELEASED
 
+### Changed
+
+- Add `Accept: application/json` header in request to fix incompatibility with 3rd party providers
+
 ## 1.0.1
 
 ### Changed
diff --git a/src/Service/Translate/src/Input/TranslateTextRequest.php b/src/Service/Translate/src/Input/TranslateTextRequest.php
index 79c5d55c8a..f9af28eed8 100644
--- a/src/Service/Translate/src/Input/TranslateTextRequest.php
+++ b/src/Service/Translate/src/Input/TranslateTextRequest.php
@@ -152,6 +152,7 @@ public function request(): Request
         $headers = [
             'Content-Type' => 'application/x-amz-json-1.1',
             'X-Amz-Target' => 'AWSShineFrontendService_20170701.TranslateText',
+            'Accept' => 'application/json',
         ];
 
         // Prepare query
diff --git a/src/Service/XRay/CHANGELOG.md b/src/Service/XRay/CHANGELOG.md
index a041193513..381534c1bd 100644
--- a/src/Service/XRay/CHANGELOG.md
+++ b/src/Service/XRay/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## NOT RELEASED
 
+### Changed
+
+- Add `Accept: application/json` header in request to fix incompatibility with 3rd party providers
+
 ## 1.1.0
 
 ### Added
diff --git a/src/Service/XRay/src/Input/PutTraceSegmentsRequest.php b/src/Service/XRay/src/Input/PutTraceSegmentsRequest.php
index f392ec1dd6..90bef1f3b9 100644
--- a/src/Service/XRay/src/Input/PutTraceSegmentsRequest.php
+++ b/src/Service/XRay/src/Input/PutTraceSegmentsRequest.php
@@ -55,7 +55,10 @@ public function getTraceSegmentDocuments(): array
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
 
         // Prepare query
         $query = [];