proxy exception, error connection timeout

使用了proxy 功能，一直连接超时，下边是日志，就是显示已经走了代理，proxy IP: http://8ec525e5ed1f4586:30102906103665@49.70.150.136:31149, 但是超时，然后我实际测试了代理地址是可用的，测试方式是curl -x http://8ec525e5ed1f4586:158295654881503@117.68.38.165:49668 -I http://47.93.177.135/123.jpg 是可以用的。

2024/05/16 23:41:28 [error] 6#6: *30 lua tcp socket read timed out, client: 172.17.208.11, server: _, request: "GET /?url=http://47.93.177.135/123.jpg HTTP/1.1", host: "172.17.243.208"
2024/05/16 23:41:28 [error] 6#6: *30 [lua] proxy_request.lua:179: proxy_request(): failed to request via proxy: timeout, proxy IP: http://8ec525e5ed1f4586:30102906103665@49.70.150.136:31149, client: 172.17.208.11, server: _, request: "GET /?url=http://47.93.177.135/123.jpg HTTP/1.1", host: "172.17.243.208"
2024/05/16 23:42:28 [error] 6#6: *30 lua tcp socket read timed out, client: 172.17.208.11, server: _, request: "GET /?url=http://47.93.177.135/123.jpg HTTP/1.1", host: "172.17.243.208"
2024/05/16 23:42:28 [error] 6#6: *30 [lua] proxy_request.lua:179: proxy_request(): failed to request via proxy: timeout, proxy IP: http://8ec525e5ed1f4586:250299687038506@180.118.241.215:34324, client: 172.17.208.11, server: _, request: "GET /?url=http://47.93.177.135/123.jpg HTTP/1.1", host: "172.17.243.208"
{ "timestamp": "2024-05-16T23:42:28+08:00", "remote_addr": "172.17.208.11", "body_bytes_sent": 57, "request_time": 121.731, "response_status": 200, "request": "GET /?url=http://47.93.177.135/123.jpg HTTP/1.1", "request_method": "GET", "host": "172.17.243.208","upstream_addr": "","args": "url=http://47.93.177.135/123.jpg","http_x_forwarded_for": "","http_referrer": "", "http_user_agent": "curl/7.61.1", "http_version": "HTTP/1.1", "proxy_ip": "http://8ec525e5ed1f4586:250299687038506@180.118.241.215:34324", "nginx_access": true }
2024/05/16 23:42:28 [error] 6#6: *30 attempt to set status 500 via ngx.exit after sending out the response status 200, client: 172.17.208.11, server: _, request: "GET /?url=http://47.93.177.135/123.jpg HTTP/1.1", host: "172.17.243.208"

Start with the proxy_request.lua:179 location named in the logs and reproduce the request using the reported target URL and proxy configuration. Compare the client behavior with the successful curl proxy test, then determine and address why the proxy request reaches a socket read timeout. Done means the request completes through a usable proxy or the failure is reported with an identified cause.