The Inspector currently doesn't really have an AJAX or XMLHttpRequest support. Firebug shows lots of information about when XHRs were sent/received and what information they contain. This is the umbrella bug representing making our AJAX support at least as good as Firebug's.
<rdar://problem/5792587>
Committed revision 31922.
Reopening since we still have some unresolved blocking bugs (bug 14313 and bug 17233 at the moment). I also remove bug 6590 as a dependency, since it doesn't really have anything to do with XHR.
Added a couple other bugs 20322, 20323
Added 22920 which is related