FiddlerChangeExpiry

In Fiddler goto Rules->Customize Rules, find "static function OnBeforeResponse(oSession: Session)" and 
add the snippet below the existing code:

if (oSession.PathAndQuery.Contains("WebTicket/WebTicketService.svc")) 
{
        if (oSession.responseCode == 200)
        {
	        var value = System.Text.Encoding.UTF8.GetString(oSession.ResponseBody); 
			
                // Replace all instances of the expires tag with 6 minutes from current.
	        // you can scope it as much as you like by leveraging https://regexr.com/ 
                var oRegEx = /(<Expires).*>.*<\/Expires>/g;
	        var newExpiresDate = DateTime.UtcNow.AddMinutes(6);
        
	        // In this case the original Expires time was in ISO format hence this was needed. 
	        var newExpiresDateStr = newExpiresDate.ToString("o");
	        var newExpires = "<Expires xmlns=\x22http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd\x22>"+newExpiresDateStr+"</Expires>"

	        value = value.replace(oRegEx, newExpires);
				
                // This is good practice so you can identify the modified responses quickly in Fiddler.
                oSession.oResponse.headers.Add("Response-Modified-By", "FiddlerCustomRule"); 

	        // In this case there were two expires tag so modifying the other one as well
	        var oRegExCert = /<Lifetime><u:Created>.*<\/u:Created><u:Expires>.*<\/u:Expires><\/Lifetime>/g;
				
	        var newExpiresCert = "<Lifetime><u:Created>" + DateTime.UtcNow.ToString("o") + "</u:Created><u:Expires>" + newExpiresDateStr + "</u:Expires></Lifetime>";
				
	        value = value.replace(oRegExCert, newExpiresCert);
				
	        oSession.ResponseBody = System.Text.Encoding.UTF8.GetBytes(value);
	}
}