687090 - Sending of XmlHttpRequest objects slows down after a few are posted, and show up as empty, but with correct headers.

Status: RESOLVED INVALID

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

Description

[brain_6]

User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:6.0.2) Gecko/20100101 Firefox/6.0.2
Build ID: 20110902133214

Steps to reproduce:

I have used XHR2, the File API, and BLObs to send large files (up to 8.8 GB so far) across the network.  I started experiencing issues in Firefox when sending multiple pieces at once, and began to use Firebug to monitor the transmission.


Actual results:

Only in Firefox (using version 6.0.2) do I have to execute code for an automatic timeout.  On the server side, any request sent that takes over 25 seconds comes through as empty, but with all the correct header information.  Also, transmission via FF takes exponentially longer than in other browsers tested.  The longest time was 3 seconds in another browser, but in FF (before the timeout was implemented) once it took 15 minutes.


Expected results:

The network traffic appears to be throttled after about 84 chunks being sent.  Once I isolated the issue with empty, I've had some fail to send over 50 times in a row before successfully reaching the server with a piece of the file.

Comment 1

[Boris Zbarsky [:bzbarsky]]

A link to a testcase showing what your code looks like would be very useful here.

Comment 2

[brain_6]

Finally, after two days of trying to track down the reason it would only happen in Firefox, a script that wasn't generated by the webpage threw an error.  Apparently, network traffic simply for Firefox has extra security where I work, and it was limiting Firefox, not actually the application causing the slow down.