Set max-age=0 for all resources, except those with lastmod parameter
#65
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Fixes iftechfoundation#64. Setting max-age=0 ensures that we'll always return fresh HTML content. This won't blow out our bandwidth, because browsers/nginx/Cloudflare will still do conditional `GET` requests, which we'll respond with a cheap, fast "304 Not Modified" response in most cases. For subresources on on the subdomain, we already redirect them to the main domain, but now, we redirect them with a `?lastmod=###` parameter. URLs with that parameter can have a week-long max-age, because if they change, we'll switch to a different URL.
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Fixes #64.
Setting max-age=0 ensures that we'll always return fresh HTML content.
This won't blow out our bandwidth, because browsers/nginx/Cloudflare will still do conditional
GETrequests, which we'll respond with a cheap, fast "304 Not Modified" response in most cases.For subresources on on the subdomain, we already redirect them to the main domain, but now, we redirect them with a
?lastmod=###parameter. URLs with that parameter can have a week-long max-age, because if they change, we'll switch to a different URL.