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-395644399 IMS header unset before Origin server request.(proxy) In addition, origin responsed 200. The point is if request include IMS header, even if I unset the IMS header, pagespeed clould not optimize? > PageSpeed can't optimize resources that are served by origin with a validator like if-modified-since. If this measns, about request header include validator (IMS), it low cache hit rate occurred. Because this measn, as long as client request(browser) include IMS , Pagespeed could not cache (optimize) contents. I think this problem will occured when expired cached content of the pagespeed. I will try debug that set the proxy can be delete IMS request header in front of pagespeed
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