Get original url without non-standard port (C#)

Question

First question!

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Environment

MVC, C#, AppHarbor.

Problem

I am calling an openid provider,

Answer 1

Something like

String port = Request.ServerVariables["SERVER_PORT"] == "80" ? "" : ":" + Request.ServerVariables["SERVER_PORT"];
String virtualRoot = Url.Content("~/");
destinationUrl = String.Format("http://{0}{1}{2}", Request.ServerVariables["SERVER_NAME"], port + virtualRoot, "/callback");