Debugging Polling Duplex on localhost with ipv4.fiddler

This post takes a brief look at the options for capturing localhost HTTP traffic in the superb Fiddler2 tool but in particular demonstrates how this can be achieved using the less-renowned ipv4.fiddler keyword in a Silverlight 2 polling duplex debugging session. HTTP traffic sent to or originating from http://localhost or http://127.0.0.1 by Internet Explorer and the .NET Framework is not