Getting the HTTP Referrer in ASP.NET

Question

I'm looking for a quick, easy and reliable way of getting the browser's HTTP Referrer in ASP.Net (C#). I know the HTTP Referrer itself is unreliable, but I do want a reliable way of getting the referrer if it is present.

Answer 1

Sometime you must to give all the link like this

System.Web.HttpContext.Current.Request.UrlReferrer.ToString();

(in option when "Current" not founded)

Answer 2

You could use the UrlReferrer property of the current request:

Request.UrlReferrer

This will read the Referer HTTP header from the request which may or may not be supplied by the client (user agent).

Answer 3

Like this: HttpRequest.UrlReferrer Property

Uri myReferrer = Request.UrlReferrer;
string actual = myReferrer.ToString();

Answer 4

Use the Request.UrlReferrer property.

Underneath the scenes it is just checking the ServerVariables("HTTP_REFERER") property.

Answer 5

Request.Headers["Referer"]

Explanation

The Request.UrlReferer will throw a System.UriFormatException if the referer HTTP header is malformed (which can happen since it is not usually under your control).

As for using Request.ServerVariables, per MSDN:

Request.ServerVariables Collection

The ServerVariables collection retrieves the values of predetermined environment variables and request header information.

Request.Headers Property

Gets a collection of HTTP headers.

Request.Headers is a better choice than Request.ServerVariables, since Request.ServerVariables contains all of the environment variables as well as the headers, where Request.Headers is a much shorter list that only contains the headers.

So the best solution is to use the Request.Headers collection to read the value directly. Do heed Microsoft's warnings about HTML encoding the value if you are going to display it on a form, though.

Answer 6

string referrer = HttpContext.Current.Request.UrlReferrer.ToString();