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-395725372 Hi otto. Sorry I mistake attached debug logs. I forgot set the `proxy_set_header If-Modified-Since ""; ## ADD` New debug logs is attached again. [debug-2.log](https://github.com/apache/incubator-pagespeed-ngx/files/2084064/debug-2.log) And Last-Modified header is added by origin server. in Addition, Request is CURL command. `curl -svko /dev/null 'http://1.1.1.1/test/test.css' -H 'Host: test.com' -H 'X-forwarded-proto: https' -H 'pragma: no-cache' -H 'cache-control: no-cache' -H 'If-Modified-Since: Mon, 04 Jun 2018 09:00:52 GMT' `
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