HTTP状态码490是什么意思？

Question

I'm using Firefox with Selenium IDE for testing a Java application. If the session expires and I launch a test, I get this http status code: 490 .

Here is a snippet that illustrates how I get this http status code.

var request = new XMLHttpRequest();
request.open('GET', url, false);

// ...

request.send(null);

if (request.status === 200) {
    // ...
} else {
    alert('Something bad happen!\n(' + request.status + ') ' + request.statusText);
}

The alert dialog box shows something like this:

 Something bad happen!
 (490) 490

Answer 1

This is not a standard HTTP status codes .

It could mean anything depending on the implementation of the application you are making this request to.