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-396115663 Hi all thank you for checking ! I am not sure, this issue is related to `Last-Modified` header add by Origin server? the pagespeed removed of Last-Modified header after optimized ?(third request) If so, separate matter, client can't use browser cache.
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