igmdvc edited a comment on issue #1660: Override webp lossless decision logic URL: https://github.com/apache/incubator-pagespeed-ngx/issues/1660#issuecomment-517697969 > I am thinking about possible workarounds. Would it be possible to override the Vary: User-Agent header that pagespeed is adding into response with Vary: Accept within the NGINX configuration? Just answering myself and probably others https://github.com/apache/incubator-pagespeed-ngx/issues/1107 and https://github.com/apache/incubator-pagespeed-ngx/issues/1149. Instead of trying to force a specific order of different modules, the idea is to create a self proxy based on server block ``` server { server_name pagespeed.local; listen 80; access_log off; allow 127.0.0.1; deny all; # Pagespeed configuration pagespeed on; ... } ``` Then you can proxy the files you want to be processed by pagespeed ``` proxy_pass http://127.0.0.1:80; proxy_pass_request_headers on; proxy_set_header Host pagespeed.local; ``` Finally you can rely on map blocks to process the response returned by the self proxy and use $upstream_http_<headername> variables. For example, in my particular case: ``` map $upstream_http_Vary $custom_vary { default ''; '~*User-Agent' 'Accept'; } ```
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