I see you point, you are right that the check could be there for a reason.

I just haven't seen any implementation derived from `HttpContextBase` or `HttpRequestBase` etc which would not conform to the semantics of their *real* counterparts.

I've added the check in commit  https://github.com/miensol/Glimpse/commit/500e01a8ed25d61997c4da0b1086dc0ba1718a35