Using Fiddler with IIS7 Express

Question

I am using IIS7 Express while developing my web application. I need to use fiddler to investigate an issue and cannot figure out how to configure things so I can get the HTTP stream. It seems that IIS7 express will only listen on localhost which means I cannot access the stream.

Answer 1

This has nothing to do with IIS7 Express and everything to do with the fact that you're using loopback traffic.

Ref: https://www.fiddlerbook.com/fiddler/help/hookup.asp#Q-LocalTraffic

Click Rules > Customize Rules.

Update your Rules file like so:

static function OnBeforeRequest(oSession:Fiddler.Session)
{
    if (oSession.HostnameIs("MYAPP")) { oSession.host = "localhost:portnumber"; }
}

Then, just visit http://myapp in your browser.

Or use the address http://localhost.fiddler/ and Fiddler will use the hostname localhost instead of converting to an IP address.