Issue with Communication Being Blocked Through HAProxy

Subject: Issue with Communication Being Blocked Through HAProxy
Hello,
I understand that requests to OpenAI are routed through Cloudflare.
While the following request works correctly without a proxy, I am not receiving any response when the request is sent through HAProxy. A similar issue occurred around 07:40 KST on March 10th and was automatically resolved after about 8 hours, but I would like to know why this is happening again.

curl -sv -X POST “https://api.openai.com/v1/chat/completions” -H “Authorization: Bearer sk-xxxxx” -H “Content-Type: application/json” -d ‘{“model”:“gpt-4o”,“messages”:[{“role”:“user”,“content”:“hi”}],“max_tokens”:5}’