Hello ! I'm trying to get up a reverse proxy where my users can pass in a url of the form
https://my.server.com?https://some.other.server.com and it'll proxy to it. It works perfectly with this configuration with the proxy_pass target hard coded: ``` server { server_name my.server.com; listen [::]:443 ssl ipv6only=on; # managed by Certbot listen 443 ssl; # managed by Certbot location / { proxy_pass https://some.other.server.com; add_header Cache-Control "public, max-age=3"; add_header 'Access-Control-Allow-Origin' "$http_origin"; add_header 'X-Frame-Options' "ALLOW FROM $http_origin"; add_header 'Access-Control-Allow-Credentials' 'true'; add_header 'Vary' 'Origin'; } } ``` testing with: > curl -X POST https://my.server.com -H "Content-Type: application/json" -d > "{\"id\": \"123\"}" But if I swap out the proxy_pass target with a variable, I'm getting a 502 Bad Gateway. ``` server { server_name my.server.com; listen [::]:443 ssl ipv6only=on; # managed by Certbot listen 443 ssl; # managed by Certbot location / { proxy_pass $args; add_header Cache-Control "public, max-age=3"; add_header 'Access-Control-Allow-Origin' "$http_origin"; add_header 'X-Frame-Options' "ALLOW FROM $http_origin"; add_header 'Access-Control-Allow-Credentials' 'true'; add_header 'Vary' 'Origin'; } } ``` Testing with: > curl -X POST https://my.server.com?https://some.other.server.com -H > "Content-Type: application/json" -d "{\"id\": \"123\"}" I'm writing the $args out to the logs: log_format main 'ARGS: >>$args<<'; access_log /var/log/nginx/access.log main; and it looks fine."$args" is identical to what I had hard coded, so I know that "args" is exactly the url I want to proxy_pass to. My location is not a regular expression and according to the docs [1], variables in proxy_pass should be fair game? ----- When variables are used in proxy_pass: location /name/ { proxy_pass http://127.0.0.1$request_uri; } In this case, if URI is specified in the directive, it is passed to the server as is, replacing the original request URI. ----- Any help is much appreciated ! Jeff [1] https://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_pass
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