see http://www.fiddler2.com/fiddler2/
 
NOTE: When using the Visual Studio Developer Web Server you 
      will need to do one of the following: 
1. Call the web services using http://127.0.0.1.:55555/ (note the period after the 1)
2. Add the following to the Fiddler Rules in OnBeforeRequest function,
   remembering to change {machinename} to your computers name
 
    // [CUSTOM] Added to remap call from machine back to localhost
    if (oSession.host=="{machinename}:55555"){
        oSession.host="127.0.0.1:55555";
    }
 
For either step, remember to change the port value from 55555 to
the value you are using on your machine.