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-396176431 Hi otto Your explanation became clear to me! As you said If ETAG is exist, browser cache will enabled So, the number of requests that actually have `If-Modified Since` is gradually go down.
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