77854 2012-02-05 23:11:45 -0800 XMLHttpRequest status & statusText should be 0 & "" following an abort() 2014-03-18 08:25:13 -0700 1 1 1 Unclassified WebKit WebCore Misc. 528+ (Nightly build) PC All RESOLVED DUPLICATE 45994 P2 Normal --- 0 mark.toller webkit-unassigned ap dglazkov d-r jarred webkit.review.bot youennf oldest_to_newest 549753 0 mark.toller 2012-02-05 23:11:45 -0800 Apologies if this isn't on the correct component... Here's the scenario: A page creates an XMLHttpRequest for a file (there is a global variable 'req' which is set to the XMLHttpRequest). The onreadystatechange handler contains the following code: function() { if (req.readyState !== 4 || req.status !== 200) { return; } var txt = req.responseText; req.onreadystatechange = null; configreq = null; eval('(' + txt + ')'); }; There is also a plugin (NPAPI) running, which has a javascript function property 'onChannelChangeSucceeded'. This is set to the following code: function() { if (req) { req.abort(); req.onreadystatechange = null; req = false; } } It seems that the plugin onChannelChangeSucceeded can be called and execute the 'abort()' method whilst the onreadystatechange is being processed... i.e. the XMLHttpRequest completes, and starts processing the onreadstatechange handler, this passes the if(readyState || status) statement, but before the responseText is read into 'txt', the plugin onChannelChangeSucceeded is called, and this resets the XMLHttpRequest by calling 'abort()'. The result is that the reponseText is then empty when read in the onreadystatechange handler. I wouldn't expect the contents of the XMLHttpRequest to be changed *during* the execution of the onreadystatechange handler. 550317 1 ap 2012-02-06 14:59:00 -0800 I also wouldn't expect that. Do you have a test case that you could share? 550779 2 125801 mark.toller 2012-02-07 03:24:48 -0800 Created attachment 125801 HTML file to generate this bug using just XMLHttpRequest. This HTML page (can be served as XHTML as well) will generate the bug on my setup, using ONLY XmlHttpRequests (no plugin required). The file 'test.txt' this page retrieves simply contains the text "Bug 77854". I ran this test on an Ubuntu Linux server running webkit-gtk (build 97042, a bit old I know), accessing an apache server on the same machine. This test doesn't fail for Safari, Firefox, I.E. or Chrome (either from the Ubuntu server in the case of Chrome, or another PC for the others). 550991 3 ap 2012-02-07 08:08:16 -0800 Thank you. Sounds like Gtk folks should take a look first then. 744182 4 169165 mark.toller 2012-10-17 05:24:46 -0700 Created attachment 169165 Updated test to simply reproduce the problem. Simple page to reproduce the bug. 744183 5 mark.toller 2012-10-17 05:25:43 -0700 Now I've had some time to actually debug this issue, it appears it is a duplicate of 54162 - or at least one portion (status and statusText) of 54162. If the abort() occurs following HEADERS_RECEIVED, the status is set to 200, and then the state is changed to 'DONE', which makes the code successfully pass if (req.readyState !== 4 || req.status !== 200) { return } passing this code expects the responseText to be available and correct, but it isn't. 744194 6 169167 mark.toller 2012-10-17 05:50:26 -0700 Created attachment 169167 Patch 744203 7 169167 buildbot 2012-10-17 06:12:59 -0700 Comment on attachment 169167 Patch Attachment 169167 did not pass mac-ews (mac): Output: http://queues.webkit.org/results/14435002 New failing tests: http/tests/xmlhttprequest/status-after-abort.html 744276 8 169167 webkit.review.bot 2012-10-17 08:48:33 -0700 Comment on attachment 169167 Patch Attachment 169167 did not pass chromium-ews (chromium-xvfb): Output: http://queues.webkit.org/results/14397620 New failing tests: http/tests/xmlhttprequest/status-after-abort.html 744277 9 169167 ap 2012-10-17 08:49:31 -0700 Comment on attachment 169167 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=169167&action=review r- for lack of ChangeLog, test cases, and for broken regression test. I do not understand how this Gtk-only bug has come to modify cross-platform behavior. Could you please explain that in more detail? > Source/WebCore/xml/XMLHttpRequest.cpp:1024 > + // From the http://www.w3.org/TR/XMLHttpRequest/#the-status-attribute: > + // If the error flag is set, return 0 and terminate these steps. This comment is not very helpful. It just describes what the code below does, and provides a link to XHR spec. First, anyone working on this code would know where the spec is anyway. But also, matching an ancient version of the spec will not be relevant five years from now. We make such behavior decisions based on multiple factors, including spec compliance, and our own compatibility testing. The desired behavior is captured in regression tests, not in code comments, unless there is something exceptionally interesting to say. 745198 10 mark.toller 2012-10-18 06:17:58 -0700 When I first reported this bug, it was from a 'user' point of view, and I could only reproduce on GTK. Now I've had a chance to actually debug it, I've found the real cause, which is common to all platforms, I've updated the test and can now reproduce on all platforms. I've also changed the title to reflect the actual problem. The failing testcase (http/tests/xmlhttprequest/status-after-abort.html) was created in http://trac.webkit.org/changeset/30665 5 years ago. At that time the XHR spec did no require the status and statusText to return 0 & "" on error (i.e. after an abort()), and the change was made to align with Firefox behaviour (?) at the time. 745211 11 169404 mark.toller 2012-10-18 06:30:40 -0700 Created attachment 169404 Patch 746415 12 ap 2012-10-19 10:18:44 -0700 As you said, this looks like a duplicate of bug 54162. Why did you choose to continue work in a separate patch? The difficult part in moving it forward is not just implementing what a spec says. We need to make sure that we don't break sites that users depend on. With over 80% mobile market share belonging to WebKit, any change like this has a big chance of being bad for users and for WebKit, because authors don't even test with other engines. 746523 13 mark.toller 2012-10-19 12:19:59 -0700 (In reply to comment #12) > As you said, this looks like a duplicate of bug 54162. Why did you choose to continue work in a separate patch? A number of reasons actually: 1) This is a bug that actually occurred on our device in the field, so it's a fix we are likely to roll out. 2) It matches the spec, and also the behaviour of Opera re: status and statusText being 0 & "". 3) Internet Explorer throws (incorrectly I believe) an exception when accessing status or statusText after the abort() in this case (but certainly doesn't return values prior to the abort() call). 4) The other bug (54162) tries to fix all outstanding issues to match the spec (throwing exceptions, etc), and someone said it might be better to split and fix the issues seperately. As I was fixing this anyway for our SW, it seemed like the sensible option. > The difficult part in moving it forward is not just implementing what a spec says. We need to make sure that we don't break sites that users depend on. With over 80% mobile market share belonging to WebKit, any change like this has a big chance of being bad for users and for WebKit, because authors don't even test with other engines. I can appreciate that. I'm coming from the view that this was reported to us as a defect. I can't see the use case for being able to check what status and statusText were before an abort() was called (after all, the application could check before calling abort()). Following the call to abort(), the data is no longer available, and signalling DONE and status == 200 can (and in our case did) cause the application handler to behave as if it had succeeded. How *do* you go about checking that changes like this don't break sites users depend on? 762941 14 mark.toller 2012-11-09 06:15:49 -0800 Any further thoughts on this patch? 976983 15 169404 andersca 2014-02-05 11:17:11 -0800 Comment on attachment 169404 Patch Clearing review flag on patches from before 2014. If this patch is still relevant, please reset the r? flag. 978780 16 youennf 2014-02-10 00:57:48 -0800 This bug is handled by bug 45994 last patch (which goes a little bit beyond what its bug title says). Once bug 45994 is closed, this bug should probably be closed as well. 991671 17 youennf 2014-03-18 08:25:13 -0700 *** This bug has been marked as a duplicate of bug 45994 *** 125801 2012-02-07 03:24:48 -0800 2012-02-07 03:24:48 -0800 HTML file to generate this bug using just XMLHttpRequest. index.html application/xhtml+xml 4736 mark.toller PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0idXRmLTgiID8+CjxodG1sIHhtbG5zPSJodHRw Oi8vd3d3LnczLm9yZy8xOTk5L3hodG1sIj4KPGhlYWQ+Cjx0aXRsZT5CdWcgNzc4NTQ8L3RpdGxl Pgo8c2NyaXB0IHR5cGU9InRleHQvamF2YXNjcmlwdCI+Ci8vPCFbQ0RBVEFbCi8vIFdpbGwgYmUg bnVsbCBvciB0aGUgaGFuZGxlIHRvIG91ciBYTUxIdHRwUmVxdWVzdAp2YXIgcmVxID0gbnVsbDsK Ci8vIENvdW50ZXIgaWRlbnRpZnlpbmcgdGhlIHJlcXVlc3QuCnZhciBjb3VudCA9IDA7CgovLyBU aGUgaW5mbyBkaXYgaW4gdGhlIEhUTUwgcGFnZS4KdmFyIGluZm87CgovLyBVc2VkIHRvIHN0b3Ag dGhlIHJlcXVlc3QgcHJvY2Vzc2luZyB3aGVuIHdlJ3ZlIGNhdXNlZCBhIGZhaWx1cmUuCnZhciBm YWlsZWQgPSBmYWxzZTsKLy8gVXNlZCB0byB2YXJ5IHRoZSBzdGF0ZSAodGltaW5nKSB0byBpbnRl 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