What's the best method in ASP.NET to obtain the current domain?

Question

Hi,

I am wondering what the best way to obtain the current domain is in ASP.NET?

For instance:

http://www.domainname.com/subdir/ should yield http://www.domainname.com http://www.sub.domainname.com/subdir/ should yield http://sub.domainname.com

As a guide, I should be able to add a url like "/Folder/Content/filename.html" (say as generated by Url.RouteUrl() in ASP.NET MVC) straight onto the URL and it should work.

Answer 1

As per this link a good starting point is:

Request.Url.Scheme + System.Uri.SchemeDelimiter + Request.Url.Host

However, if the domain is http://www.domainname.com:500 this will fail.

The following resolves this:

Request.Url.Scheme + System.Uri.SchemeDelimiter + Request.Url.Host + (Request.Url.Port != 80 ? ":" + Request.Url.Port : "")

However, I get the feeling that assuming port 80 may be browser or even user configuration dependant.

Answer 2

How about:

String domain = "http://" + Request.Url.Host

Answer 3

How about:

NameValueCollection variables = HttpContext.Current.Request.ServerVariables; string protocol = (variables["SERVER _ PORT _ SECURE"] == "1") ? "https://" : "http://"; string domain = variables["SERVER _ NAME"]; string port = variables["SERVER _ PORT"];

(Remove the spaces around the underscores in the server variable indexers.)

Answer 4

Another way:

string domain;
Uri url = HttpContext.Current.Request.Url;
domain= url.AbsoluteUri.Replace(url.PathAndQuery, string.Empty);

Answer 5

Same answer as Graphain's but with some modification. This checks for the default port instead.

Request.Url.Scheme + System.Uri.SchemeDelimiter + Request.Url.Host +
(Request.Url.IsDefaultPort ? "" : ":" + Request.Url.Port)