jmarantz 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-395635124 Could you try fetching the CSS file three times? On the first request, PageSpeed will collect the resource as it streams through the system, saving it in its HTTP cache. On the second request, a rewrite of the CSS file will be initiated in a background thread. This will probably take a few milliseconds, or more if there are images referenced in the CSS file and the need to be optimized. On the third request -- if enough time has elapsed since the second request, the CSS file (and the referenced images) should all be optimized.
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