400. That’s an error.

The server cannot process the request because it is malformed. It should not be retried. That’s all we know.

/* User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:27.0) Gecko/20100101 Firefox/27.0 */Error 400 (Bad Request)!!1

400. That’s an error.

The server cannot process the request because it is malformed. It should not be retried. That’s all we know.

/* User Agent: Mozilla/5.0 (Windows NT 6.3; rv:39.0) Gecko/20100101 Firefox/39.0 */Error 400 (Bad Request)!!1

400. That’s an error.

The server cannot process the request because it is malformed. It should not be retried. That’s all we know.