Session Alerts

Updated on Nov 6, 2025

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);