To create alerts for specific sessions, add rules using FiddlerScript. For example:
Play a sound when a file is missing. (in OnBeforeResponse)
if (oSession.responseCode == 404){ FiddlerObject.playSound("C:\\windows\\media\\ding.wav"); oSession["ui-strikeout"]="true"; }
Show HTTP POST bodies in a messagebox (in OnBeforeRequest)
var oBodyString = oSession.GetRequestBodyAsString(); if (oBodyString.Length > 0) FiddlerObject.alert(oBodyString);