andrewhavens commented on issue #1895: Optimized image URLs 404 when using default config URL: https://github.com/apache/incubator-pagespeed-mod/issues/1895#issuecomment-498759354 Hi @oschaaf, thanks for your help. I was reading through the logs and I also found it strange that it was redirecting from http to https since the original request protocol was already using https. I found in the logs this line prior to the redirect: ``` Jun 03 16:13:35 myapp-pr-38 app/web.1: 2019/06/03 23:13:34 [debug] 132#0: *310 http header: "X-Forwarded-Proto: https" ``` I think what's happening is that Heroku is internally passing along this header in the request, but pagespeed was not including it in its internal requests. So I started searching the documentation and found that there is a configuration setting to enable this: ``` pagespeed RespectXForwardedProto on; ``` Once I added that, it started working.
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