INFO: 127.0.0.1:56991 - "POST /mcp HTTP/1.1" 307 Temporary Redirect INFO: 127.0.0.1:56991 - "POST /mcp/ HTTP/1.1" 200 OK After using mcp.run(transport="streamable-http") to start the server, why does the client always redirect to '/mcp/' when requesting the server?