redbox-cdn 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-395640260 Hi > a) if you remove the if-modify-since header, optimization works, at least after 3 requests? no, it does not optimized least after 3 request. > b) If you include the if-modify-since header, optimization fails yes This problem is occurred first request if Pagespeed has not contents cached. I tried below situation. Send the first request (not include the "If-modify-since" header ) *PageSpeed can be cached. when send the second request with "if modify since" header. Pagespeed returned optimized contents.
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