code HPE_INVALID_METHOD

[Gormartsen]

server.on('clientError', (err, socket) => {
    if (err.code === 'HPE_INVALID_METHOD')
        socket.end('HTTP/1.1 501 Not Implemented\r\n\r\n');
    else
        socket.end('HTTP/1.1 400 Bad Request\r\n\r\n');
});

For some reason request library send broken request with not detected METHOD

nodejs/node#6554 (comment)