Opera Developer Console

It figures I would find this as I wrap up the initial draft of the chapter on client-side debugging, but it makes me extremely happy to see it: Opera has started work on a Developer Console, which (among many other things) logs XMLHttpRequest calls.

The Opera Developer Community runs through some of the DOM, JavaScript, and CSS tools, and the Opera Desktop team posted about it over a month ago when they initially started putting it into their development builds.

From what I can tell by peaking at the source (since, like most Opera extensions, they wrote it in JavaScript), it looks like they made a simple wrapper object and replaced the native object (after storing a backup reference for when logging gets shut off again) in order to create hooks into each of the events so it can report everything as it happens.

This means that I can now debug XMLHttpRequest usage in more than one browser, which makes life much easier than either guessing how it went or using a standalone traffic sniffer.

Edited two minutes later to add: you can get it from the Opera Developer Tools page.