Monitor traffic to localhost from IE or .NET

To monitor traffic sent to http://localhost or http://127.0.0.1 from IE8 or below or the .NET Framework:

• Use your machine name as the hostname instead of Localhost or 127.0.0.1

  For example, instead of

    http://localhost:8081/mytestpage.aspx
  

  Go to:

    http://machinename:8081/mytestpage.aspx
  

• Use one of these addresses:

  -To use the IPv4 adapter (recommended for the Visual Studio test webserver, codename: Cassini):

    http://ipv4.fiddler
  

  -To use the IPv6 adapter:

    http://ipv6.fiddler
  

  -To use localhost in the Host header:

    http://localhost.fiddler
  

• Click Rules > Customize Rules... and add this code to the Rules file:

  static function OnBeforeRequest(oSession:Fiddler.Session){
  if (oSession.HostnameIs("MYAPP")) { oSession.host = "127.0.0.1:8081"; }
  }
  

  Now, http://myapp will act as an alias for 127.0.0.1:8081