Fiddler Custom Rules example

fiddler.js

static function OnBeforeResponse(oSession: Session) {
        if (oSession.hostname.Contains("exacttarget.com"))
        {
            oSession.oResponse.headers.Add("Access-Control-Allow-Origin", "*");
        }
        
        if (m_Hide304s && oSession.responseCode == 304) {
            oSession["ui-hide"] = "true";
        }
    }