[GitHub] [incubator-pagespeed-mod] andrewhavens opened a new issue #1895: Optimized image URLs 404 when using default config

[GitBox]

andrewhavens opened a new issue #1895: Optimized image URLs 404 when using 
default config
URL: https://github.com/apache/incubator-pagespeed-mod/issues/1895
 
 
   nginx version: 1.15.6
   pagespeed version: 1.13.35.2-0
   
   Observed behavior:
   * Optimized image URLs are replaced in HTML
   * Loading the page on one screen (e.g. low dpi) requests the `@1x` images, 
which successfully loads the optimized webp images:
     * 
`xhero,401x-6a6e57f7fca63357e1ebd32e176c34f4fd8c5fad5460fa33002e39e28b6412f8.jpg.pagespeed.ic.PCXO2e9LPX.webp`
   * Loading on another screen (e.g. high dpi) requests the `@2x` images, but 
they all 404:
     * 
`xhero,402x-703e0140208613824bbbc7c0a4265a1927f80a1bd0aee3c9a463cd2a7db20926.jpg.pagespeed.ic.e84ta-HJhq.webp`
   * Manually requesting the unoptimized image loads without issue:
     * 
`h...@2x-703e0140208613824bbbc7c0a4265a1927f80a1bd0aee3c9a463cd2a7db20926.jpg`
   * The behavior is not consistent. I can purge the cache and successfully 
load the `@2x` images but then the `@1x` images don't load.
   
   
   Relevant sections of our nginx config:
   ```
   pagespeed on;
   pagespeed Domain https://ourapp.herokuapp.com;
   pagespeed FetchHttps enable;
   pagespeed FileCachePath /app/var/ngx_pagespeed_cache;
   pagespeed RewriteLevel CoreFilters;
   pagespeed EnableFilters debug;
   
   # NOTE: Setting HttpCacheCompressionLevel to zero fixes a bug with double 
gzip compression.
   pagespeed HttpCacheCompressionLevel 0;
   
   upstream app_server {
     server unix:/tmp/nginx.socket fail_timeout=0;
   }
   
   server {
     # ...
   
     location / {
       proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
       proxy_set_header Host $http_host;
       proxy_redirect off;
       proxy_pass http://app_server;
     }
   
     location ~ "\.pagespeed\.([a-z]\.)?[a-z]{2}\.[^.]{10}\.[^.]+" {
       add_header "" "";
     }
     location ~ "^/pagespeed_static/" { }
     location ~ "^/ngx_pagespeed_beacon$" { }
   }
   ```
   

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