{{tag>nginx "query parameter" redirect proxy}}

====== Redirect to another site from query parameter in nginx ======
If you have an URL for example:

  https://sub.domain.com/some_image?src=https://www.someotherdomain.com/file/thumbnail/blahblah/43433/image.jpg

You can do a redirect to a URL in the //src// parameter by using below in nginx when visiting above URL.

<code nginx>
     location /some_image {
            proxy_pass $arg_src;
            proxy_set_header Host $host;
            resolver 127.0.0.11;
        }
</code>

Below could also work (not tested):
<code nginx>
location @fetchFromRemote {
        rewrite ^/some_image(.*)$ $arg_src redirect;
    }
    
location ^~ /some_image {
        try_files $arg_src @fetchFromRemote;
    }
</code>

====== Tested on ======
  * nginx/1.21.4

====== See also ======
  * [[Nginx redirect/rewrites]]
====== References ======
  * https://stackoverflow.com/questions/57937222/502-bad-gateway-nginx-no-resolver-defined-to-resolve
  * https://stackoverflow.com/questions/8130692/how-can-query-string-parameters-be-forwarded-through-a-proxy-pass-with-nginx