Today, you have to write annoying code like:

if (((oSession.responseCode == 301) ||
   (oSession.responseCode == 302) ||
   (oSession.responseCode == 303) ||
   (oSession.responseCode == 307) ||
   (oSession.responseCode == 308))  { ... do redirect stuff }

It would be better if there were a way to test a bunch of codes at once in an Enumerable (e.g. oSession.ResponseCodeIn([301,302,303,307,308])

It would also be nice if you could do:

if (oSession.oResponse.IsStatusRedirect() || oSessionl.oResponse.IsStatusClientError() || oSession.oResponse.IsStatusServerError() || oSession.oResponse.IsStatusSuccess())

...where each method returns true for 3xx, 4xx, 5xx, and 2xx.