ERR_NGROK_6522: The header beginning with PREFIX...' exceeds the maximum header name length of BYTES bytes - ngrok documentation

What does ERR_NGROK_6522 mean?

ngrok returns ERR_NGROK_6522 with this message:

The header beginning with <PREFIX>...' exceeds the maximum header name length of <BYTES> bytes.

Troubleshoot ERR_NGROK_6522 with your AI agent. Connect it to the ngrok MCP server, then ask what caused the error and how to fix it.

Where can I get more help with ERR_NGROK_6522?

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