oschaaf commented on issue #1570: PageSpeed could not optimize (Proxy_pass) if response returned 200 URL: https://github.com/apache/incubator-pagespeed-ngx/issues/1570#issuecomment-395719603 In the logs nginx is responding with 304 to the IMS request. Which is what pagespeed wil observe and pass through unchanged. AFAICT ngx_pagespeed will not add the `Last-Modified` header, which is needed to end up with IMS requests. So then the next question is: where are these IMS headers in requests are coming from? Probably you are observing revalidation of content that was served before ngx_pagespeed was introduced? I would expect the number of IMS requests gradually go down naturally. If you really want you can accelerate that process by artificially bumping the last-modified dates.
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