If you don't already have Fiddler, get it.
The problem:
Web traffic to and from your local ASP.NET development server is not captured by Fiddler 2.
The solution:
Replace "localhost" in the request with "somesite.com". Somesite just loops back to 127.0.0.1 (localhost), but Fiddler will now capture the request.
For example:
Change http://localhost:4028/devsite/Default.aspx to http://somesite.com:4028/devsite/Default.aspx.

