Unable to initiate oauth for server.

[zelch]

My company has an internal MCP server, which supports the OAuth authentication flow.

If I use the current version of @modelcontextprotocol/inspector everything works fine.

But with mcphub I'm getting some rather unhelpful errors, and I'm not sure how to debug things from here:

  [00:56:38]  'Internal Server' error: Unexpected token '<', "<!DOCTYPE "... is not valid JSON  
  [00:56:38]  'Internal Server' failed to start connection with http and sse transports: Unexpected token '<', "<!DOCTYPE "... is not valid JSON  
  [00:56:38]  'Internal Server' failed to start connection: Unexpected token '<', "<!DOCTYPE "... is not valid JSON  
  [00:56:38]  'Internal Server' transport closed  

(And since it's a strictly internal server, I can't do the helpful thing of putting the URL in the bug report so that you can try to reproduce, sorry about that.)