AJAX XMLHttpRequest错误标志

Question

I made a query to an address and I got the readyState = 4, and the status = 0.

After I read the documentation for the XMLHttpRequest, it says if the status = 0 and readyState = 4, then check the associated error flag.

How can I see what's in this error flag to determine the cause of the status not being set to 200?

Answer 1

I've heard that the XHR editor said that the error flag referenced in the spec is an internal implementation variable that consumers cannot access.

In other words, you can't see that "error flag".