Chaoz, the problem with testing is you have to have the right info before you can do the test.

If I want to test chained proxies I have to:

*. Know how to set up the chain in the browser window (type [url]http://[/url] before each proxy or not?), and

2. Discover which proxies allow chaining.

I can't do #2 if I don't know #*.

Kind people have given some great URLs here. But sometimes these pages give conflicting or inadequate information. Like this subject we're discussing.