How to get “Host:” header from HttpContext (asp.net)

Question

I need to server parts of my application from different domains. To be precise I have a sub section of the site that should be served from a region specific domain. For exam

Answer 1

string requestedDomain = HttpContext.Current.Request.ServerVariables["HTTP_HOST"];
string requestScheme = HttpContext.Current.Request.Url.Scheme;
string requestQueryString = HttpContext.Current.Request.ServerVariables["QUERY_STRING"];
string requestUrl = HttpContext.Current.Request.ServerVariables["URL"];