IMN-873 - samlLoginCallback 400 error - fixing urlencoded body parsing (

#1057)

packages/backend-for-frontend/src/app.ts

@@ -7,6 +7,7 @@ import {
   initRedisRateLimiter,
   rateLimiterMiddleware,
 } from "pagopa-interop-commons";
+import express from "express";
 import { config } from "./config/config.js";
 import privacyNoticeRouter from "./routers/privacyNoticeRouter.js";
 import { getInteropBeClients } from "./clients/clientsProvider.js";
@@ -54,8 +55,13 @@ app.disable("etag");
 
 app.use(loggerMiddleware(serviceName));
 
+// parse files from multipart/form-data and put them in req.body
 app.use(multerMiddleware);
 app.use(fromFilesToBodyMiddleware);
+
+// parse application/x-www-form-urlencoded and put it in req.body
+app.use(express.urlencoded({ extended: true }));
+
 app.use(contextMiddleware(serviceName, true));
 
 app.use(