Getting the Http Referrer in ASP.NET

Getting the HTTP Referrer in ASP.NET

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).

Getting referrer in asp net mvc

Usually, Referrer URLs are passed between two unrelated sites (from one site to another) when navigation occurs by clicking a link or JavaScript-based navigation. Referrer URLs are not sent if the user uses the browsers address bar, back/forward buttons/ etc.. to navigate.

There are several reasons why the Referrer URL is empty in a request.

• For some (security/privacy) reasons, the Referrer URL is stripped out
  when navigating from a HTTPS site to a HTTP site (e.g. from
  https://google.com to http://example.com).

• It can also be stripped out using some other JavaScript
  and HTML tricks.

once Referrer URL has been stripped out, There is no way to disable this behavior to get it back.

How can I get Url Referrer in ASP.NET Core MVC?

You're almost there. The StringValues class is just a type ASP.NET uses to efficiently represent strings in the framework. Especially in the HttpContext object. You can just call ToString() on it to convert it to a string:

string referer = Request.Headers["Referer"].ToString();

get referrer from a specific page in same domain C#

I was able to figure it out. Took some parts of Albert's code and made some changes to mine.

      Uri referrer = HttpContext.Current.Request.UrlReferrer;

      string urlName = Request.UrlReferrer.ToString(); // grabbing referring page address        
      
        if (referrer == null && urlName != "default.aspx")
        {
            Response.Redirect(url: "default.aspx", endResponse: false);
            return;
        } 

        if (!IsPostBack)
        {
            if(Session["customerID"] == null && urlName != "default.aspx") //If both are false they go to homepage
            {
                Response.Redirect(url: "default.aspx", endResponse: false);
            }
            else
            {
                customerInfo(); //or else they get the customer info on the customer page
            }
        }

How do I get the referrer URL in an ASP.NET MVC action?

You can use Request.UrlReferrer to get the referring URL as well if you don't like accessing the Request.ServerVariables dictionary directly.

Spoofing HTTP Referrer data using ASP.NET

I don't know if this exactly what you want, but in general, you should be able to spoof the value of the UrlReferer property (even if it's read-only) in HttpContext.Current.Request by using a bit of reflection.

For example:

FieldInfo fi = HttpContext.Current.Request.GetType().GetField("_referrer", BindingFlags.NonPublic | BindingFlags.Instance);

string initialReferer = HttpContext.Current.Request.UrlReferrer.ToString();
if (fi != null)
    fi.SetValue(HttpContext.Current.Request, new Uri("http://example.com"));
string fakedReferer = HttpContext.Current.Request.UrlReferrer.ToString();

On VS; these are the values before and after changing the UrlReferrer:

initialReferer
"http://localhost/Test/Default.aspx"
fakedReferer
"http://example.com/"

If you open the System.Web assembly using ILSpy you'll notice that the UrlReferrer property looks something like this:

public Uri UrlReferrer
{
    get
    {
        if (this._referrer == null && this._wr != null)
        {
            string knownRequestHeader = this._wr.GetKnownRequestHeader(36);
            if (!string.IsNullOrEmpty(knownRequestHeader))
            {
                try
                {
                    if (knownRequestHeader.IndexOf("://", StringComparison.Ordinal) >= 0)
                    {
                        this._referrer = new Uri(knownRequestHeader);
                    }
                    else
                    {
                        this._referrer = new Uri(this.Url, knownRequestHeader);
                    }
                }
                catch (HttpException)
                {
                    this._referrer = null;
                }
            }
        }
        return this._referrer;
    }
}

How to extract scheme, host, path, and query string from the HTTP Referer using C# ASP.NET Core

if you save the referrer as a string say refURL = Context.Request.Headers["Referer"].ToString()

Then

var address = new System.Uri(refURL);

var scheme = address.Scheme ;
var host = address.Host;

etc

details on Uri Class

How do I identify the referrer page in ASP.NET?

Look at the Segments property of the URI class (which is what HttpContext.Current.Request.UrlReferrer returns).

Something like HttpContext.Current.Request.UrlReferrer.Segments[1] (changing the 1 indexer to get the correct segment you require).

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