Not able to NGINX log where the request is getting forwarded

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There are multiple nginx conf in my system and I want to debug where nginx is forwading the request for debugging purpose.

I wanted see in the nginx log with the proxy_pass value

location /api/superadmin/ {
        proxy_pass http://127.0.0.1:9039;
    }

For example in the logs

119.82.108.182 - - [18/Dec/2023:09:06:37 +0000] "GET /api/superadmin/ HTTP/1.1" 200 52 "-" "PostmanRuntime/7.29.0" "-"

In the above log wanted to see proxy_pass value as well for debugging. How to check this?

The log_format and access_log directives allow you to customise the access log or even generate multiple access logs for different purposes. See the log module.

Logging $server_name and $server_port will help identify which server { ... } block handled the request, by showing the value of the server_name and listen directives within that block. Or - if the server name is missing.

Logging $proxy_host and $proxy_port will help identify which proxy the request was forwarded to using proxy_pass. Or - if the request was handled differently.

For example, the following statements placed in the http block, will append the above information to test.log, for requests to any server block:

log_format test '$remote_addr - $remote_user [$time_local] '
                '"$request" $status $body_bytes_sent '
                '"$server_name:$server_port" "$proxy_host:$proxy_port"';

access_log /var/log/nginx/test.log test;

Change the access_log logfile path to match the one used by your OS.

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