add proxy logs

[sify21]

I see no logs when the proxy is successful, please add more logs, I depend on the logs (and elk) for analysis purpose.

See reverse_proxy logs for example:

{"level":"debug","ts":1725981949.9330766,"logger":"http.handlers.reverse_proxy","msg":"selected upstream","dial":"127.0.0.1:8001","total_upstreams":2}
{"level":"debug","ts":1725981949.93399,"logger":"http.handlers.reverse_proxy","msg":"upstream roundtrip","upstream":"127.0.0.1:8001","duration":0.000840843,"request":{"remote_ip":"127.0.0.1","remote_port":"54300","client_ip":"127.0.0.1","proto":"HTTP/1.1","method":"GET","host":"localhost:8000","uri":"/","headers":{"User-Agent":["curl/7.81.0"],"X-Forwarded-For":["127.0.0.1"],"X-Forwarded-Proto":["http"],"X-Forwarded-Host":["localhost:8000"],"Accept":["*/*"]}},"headers":{"Date":["Tue, 10 Sep 2024 15:25:49 GMT"],"Content-Length":["14"],"Content-Type":["text/plain; charset=utf-8"]},"status":200}

At least a log about the request object is needed.