User try to chat under https://www.openai.com or https://chat.openai.com/chat using ChatGPT.
Proxy is running version 6.7 and doing SSL interception in the policy.
On the developer tool, the response code when user sends the chat request is 403.
However when proxy is running version 7.3 and with SSL interception in the policy, it works fine.
This is due to the HTTP/2 supportability in version 6.7 which is not supported.
There are two options:
1. Maintain the proxy with version 6.7 and disable SSL interception in the policy or disable protocol detection for the requested URL.
2. Upgrade to version 7.3 which have HTTP/2 support by default.