ERR_NGROK_3604: HTTP Status Code CODE does not allow including a response body

What does ERR_NGROK_3604 mean?

ngrok returns ERR_NGROK_3604 with this message:

HTTP Status Code <CODE> does not allow including a response body.

Troubleshoot ERR_NGROK_3604 with your AI agent. Connect it to the ngrok MCP server, then ask what caused the error and how to fix it.

Email support@ngrok.com and include the error code.