14431 2007-06-27 08:01:11 -0700 XMLHttpRequest readyState 3 & responseText buffer issues 2007-08-28 12:21:50 -0700 1 1 1 Unclassified WebKit XML 523.x (Safari 3) All All RESOLVED FIXED http://www.synchroedit.com/pt/ InRadar P2 Normal --- 1 kalle.alm webkit-unassigned ap ChristopherA ddkilzer kalle.alm oldest_to_newest 6088 0 kalle.alm 2007-06-27 08:01:11 -0700 Safari 3 does not seem to handle the updating of the responseText buffer during readyState 3 (interactive/loading) of XMLHttpRequests appropriately. The expected behavior is that whenever the server sends/flushes output to the client (browser), the client sets readyState to 3 (if not already), updates the responseText buffer, and triggers a readystatechange. Safari seems to only set readyState to 3 once (when loading begins and responseText is an empty string) and then nothing until the loading finishes (readyState -> 4). During tests, we discovered that by "priming" the connection as described by M. Stachowiak below, Safari for Mac OS X seemed to get it some times, but not all. By increasing the "garbage" from 256 to 512 bytes, this solution might work all the time, but this solution isn't exactly ideal. In email discussion, Geoffry Garen confirmed that Safari 3 does indeed issue a ready state change of 3 every time it receives data, and that responseText IS updated every time, which indicates the above behavior is a bug. We have additionally tried two workarounds, as proposed by Maciej Stachowiak, namely: 1) "prime" the connection with 256 bytes sent before any of the real data. 2) Use a MIME type that won't be subject to sniffing (I think "application/xml" as opposed to "text/xml" may fit the bill). From our tests, it would appear that neither of the above tests seem to do the trick on our example code. Demo URLs: - http://www.synchroedit.com/pt/ (perl test -- clean) - http://www.synchroedit.com/pf1/ (perl fixes 1+2 above) - http://www.synchroedit.com/pf2/ (perl fix 2 only) Source code URLs: - http://www.synchroedit.com/pt/perl-test.tar.gz - http://www.synchroedit.com/pf1/perl-fix-1.tar.gz - http://www.synchroedit.com/pf2/perl-fix-2.tar.gz 6086 1 ap 2007-06-27 09:31:49 -0700 Since the network layer is outside WebKit (and is not open-source), you may want to also file a bug at <http://bugreport.apple.com> (free registration required). Please post the resulting "Radar" number here. Once we get a method to disable buffering, we'll need to use it for XMLHttpRequests. 6079 2 kalle.alm 2007-06-27 10:13:00 -0700 Submitted report at Apple as well. Problem ID is 5298296. 6076 3 ap 2007-06-27 11:24:04 -0700 Thank you! 5713 4 kalle.alm 2007-07-02 13:12:42 -0700 This test WORKS FINE in the iPhone version of Safari. 1333 5 andersca 2007-08-28 12:21:50 -0700 Committed revision 25274. However, this also depends on changes to lower-level frameworks so it won't work until newer versions of those have been released.