Bug 46012 – XMLHttpRequest: readystatechange event is not dispatched when open() is called.

• Component: XML
• Status: RESOLVED CONFIGURATION CHANGED

[Jian Li]

XMLHttpRequest: readystatechange event is not dispatched when open() is called.

Per the XHR spec, readystatechange event should be dispatch when we finish processing open().

TESTS:
http://tc.labs.opera.com/apis/XMLHttpRequest/abort-after-send.htm
http://tc.labs.opera.com/apis/XMLHttpRequest/open-after-abort.htm
http://tc.labs.opera.com/apis/XMLHttpRequest/open-open-send.htm
http://tc.labs.opera.com/apis/XMLHttpRequest/open-open-sync-send.htm
http://tc.labs.opera.com/apis/XMLHttpRequest/open-send-open.htm
http://tc.labs.opera.com/apis/XMLHttpRequest/open-open-sync-send.htm

[Joe Thomas]

(In reply to comment #0)
> XMLHttpRequest: readystatechange event is not dispatched when open() is called.
> 
> Per the XHR spec, readystatechange event should be dispatch when we finish processing open().
> 
> TESTS:
> http://tc.labs.opera.com/apis/XMLHttpRequest/abort-after-send.htm
> http://tc.labs.opera.com/apis/XMLHttpRequest/open-after-abort.htm
> http://tc.labs.opera.com/apis/XMLHttpRequest/open-open-send.htm
> http://tc.labs.opera.com/apis/XMLHttpRequest/open-open-sync-send.htm
> http://tc.labs.opera.com/apis/XMLHttpRequest/open-send-open.htm
> http://tc.labs.opera.com/apis/XMLHttpRequest/open-open-sync-send.htm


Currently webkit sends readystatechange event with state "OPENED" when Open() gets called. 

As per w3c spec http://www.w3.org/TR/XMLHttpRequest/#the-send-method, section 4.7.6(8), readystatechange event needs to be called with the same state for asynchronous XMLHTTPRequest once the Send() flag is set. Looks like this is not happening with webkit. Do we need a fix for this ?

[Joe Thomas]

Created attachment 125016 [details]
Simplified test case

Simplified test case showing the sequence of state when readystatechange event is fired.

Webkit browsers fires readystatechange event with [1,2,3,4] (OPENED, HEADERS_RECEIVED, LOADING, DONE) whereas Firefox and IE fires with states [1,1,2,3,4]. As per spec, readystatechange event is supposed to be fired when Send() is called for asynchronous request but webkit does not do that.

I will create a patch if we agree to add this.

[Alexey Proskuryakov]

*** Bug 71985 has been marked as a duplicate of this bug. ***

[Alexey Proskuryakov]

The duplicate has some relevant analysis.

[Anne van Kesteren]

This has been addressed in the past decade.