942942 - XMLHTTPRequest randomly fails with status code 0 during multiple requests

Status: RESOLVED INCOMPLETE

(Core :: DOM: Core & HTML, defect)

Description

[Marcus Fritze]

I created a example (see URL), where you can see that the status code of a XMLHTTPRequest is sometimes 0.

Open the example and continue with your work (browse the web or do some stuff that requires a lot of CPU and HDD write read access)!

The example makes a request to the own server and the response should be 200. Sometimes when Firefox is slow or almost not responding or Firefox "calculates" some other stuff, Firefox fails with status code 0.

The request interval and the request URL can be modified in the online.js file.

This file is based on the following project: https://github.com/PixelsCommander/OnlineJS

You can test it for yourself. You only need the index.html, online.js and online.php

Info: When you run Peacekeeper Browser Benchmark, almost at the end of this test, Firefox has a lot of stuff to do and the status 0 error counts up.

Comment 1

[Marcus Fritze]

Attachment: index.html

index.html - example

Comment 2

[Marcus Fritze]

Attachment: online.js

online.js - example

Comment 3

[Marcus Fritze]

Attachment: online.php

online.php - example

Comment 4

[Marcus Fritze]

Bug 488605 is maybe the same issue

Comment 5

[Marcus Fritze]

I should also mention, that this bug also occurs on Windows systems.

Comment 6

[Stefano Ciccarelli]

That bug is hitting our product very often.
We noticed that if Firefox is working on something slow the status code 0 bug happens very often.

Comment 7

[Honza Bambas (:mayhemer)]

Marcus, I'll ask you for an NSPR log:

https://developer.mozilla.org/en-US/docs/Mozilla/Debugging/HTTP_logging

Please also provide the URL of the XHR that failed for you.

Thanks.

Comment 8

[Honza Bambas (:mayhemer)]

Lack of progress.