Hey Guys maybe can help me out, I am trying to cache an Image which every 5 minutes has a timestamp update in the path so it will always give a MISS after 5 minutes even if set to expire after 1h for example.

This is the Request URL: http://example.com//imagecache/?ts=1660906289182&url=http://website.com/image.jpg

Here the "ts=..." is changing every 5 minutes

Here is the nginx config:

    location = /imagecache/ {
           proxy_cache my_cache;
           proxy_cache_revalidate on;
           proxy_cache_min_uses 1;
           proxy_cache_lock on;
           proxy_cache_lock_timeout 5s;
           proxy_set_header Host $host;
           proxy_cache_key $request_uri;
           proxy_cache_valid 200 304 30m;
           proxy_cache_valid 302 301 2h;
           proxy_cache_valid any 5m;
           proxy_ignore_headers Cache-Control Expires Set-Cookie;
           proxy_cache_methods GET HEAD POST;
           proxy_cache_background_update on;
           proxy_cache_use_stale error timeout invalid_header http_403 http_404 http_429 http_500 http_502 http_503 http_504;
           add_header X-Cache-Status $upstream_cache_status;
           add_header X-Cache-Date $upstream_http_date;
           proxy_pass http://${BACKEND_HOSTNAME}:8080/html/mock/imageload.jsp?url=$arg_url;

I did try with reqrite but somehow was not working.

What I need is to ignore the ?ts=& and always see it as the same image and cache it in so like this the proxy_cache_valid time is used as it should.

The timestamp is changing but the image is the same.

Thanks for the help in advance.

CodePudding user response：

You can set your proxy_cache_key to exclude the ts query param and only include arg_url using http://nginx.org/en/docs/http/ngx_http_core_module.html#var_arg_

proxy_cache_key $scheme://$proxy_host$uri$is_args$arg_url;

If you have multiple query params you want to include and only exclude ts, you can create a map that regexes that query param out and then use it in your proxy_cache_key.