fiddler-rule.js

/*
1. In Fiddler, use "Ctrl+R" to open up the rules file.
2. Ctrl+F for "OnBoot" and uncomment it if it is (it is by default)
3. Replace the body of it with the one below and add the "ValidateCallback" function below OnBoot.
*/

static function OnBoot() {
    FiddlerApplication.add_OnValidateServerCertificate(ValidateCallback);
}

static function ValidateCallback(sender, e : ValidateServerCertificateEventArgs) {
    FiddlerApplication.Log.LogString("Auto accepting certificate for " + e.Session.host);
    e.ValidityState = CertificateValidity.ForceValid;
}