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HttpListenerRequest.UrlReferrer Property

Gets the Uniform Resource Identifier (URI) of the resource that referred the client to the server.

Namespace: System.Net
Assembly: System (in system.dll)

public Uri UrlReferrer { get; }
/** @property */
public Uri get_UrlReferrer ()

public function get UrlReferrer () : Uri

Not applicable.

Property Value

A Uri object that contains the text of the request's Referer header, or a null reference (Nothing in Visual Basic) if the header was not included in the request.

If a client has followed a hyperlink to the requested URI, its request might contain a Referrer header that identifies the URI of the resource that contained the hyperlink.

Clients can falsify or choose not to present a Referer header. Therefore, while the UrlReferrer property can be useful for identifying broad trends in Web traffic; you should not use it as part of an authorization scheme to control access to data.

For a complete list of request headers, see the HttpRequestHeader enumeration.

The UrlReferrer is null when there is no Referrer header in the request or when the Referrer header is present in the request but does not parse to a valid Uri.

The following code example demonstrates using this property.

public static void ShowRequestProperties1 (HttpListenerRequest request)
{
    // Display the MIME types that can be used in the response.
    string[] types = request.AcceptTypes;
    if (types != null)
    {
        Console.WriteLine("Acceptable MIME types:");
        foreach (string s in types)
        {
            Console.WriteLine(s);
        }
    }
    // Display the language preferences for the response.
    types = request.UserLanguages;
    if (types != null)
    {
        Console.WriteLine("Acceptable natural languages:");
        foreach (string l in types)
        {
            Console.WriteLine(l);
        }
    }
    
    // Display the URL used by the client.
    Console.WriteLine("URL: {0}", request.Url.OriginalString);
    Console.WriteLine("Raw URL: {0}", request.RawUrl);
    Console.WriteLine("Query: {0}", request.QueryString);

    // Display the referring URI.
    Console.WriteLine("Referred by: {0}", request.UrlReferrer);

    //Display the HTTP method.
    Console.WriteLine("HTTP Method: {0}", request.HttpMethod);
    //Display the host information specified by the client;
    Console.WriteLine("Host name: {0}", request.UserHostName);
    Console.WriteLine("Host address: {0}", request.UserHostAddress);
    Console.WriteLine("User agent: {0}", request.UserAgent);
}

public static void ShowRequestProperties1(HttpListenerRequest request)
{
    // Display the MIME types that can be used in the response.
    String types[] = request.get_AcceptTypes();
    if (types != null) {
        Console.WriteLine("Acceptable MIME types:");
        for (int iCtr = 0; iCtr < types.get_Length(); iCtr++) {
            String s = types[iCtr];
            Console.WriteLine(s);
        }
    }
    // Display the language preferences for the response.
    types = request.get_UserLanguages();
    if (types != null) {
        Console.WriteLine("Acceptable natural languages:");
        for (int iCtr = 0; iCtr < types.get_Length(); iCtr++) {
            String l = types[iCtr];
            Console.WriteLine(l);
        }
    }
    // Display the URL used by the client.
    Console.WriteLine("URL: {0}", request.get_Url().get_OriginalString());
    Console.WriteLine("Raw URL: {0}", request.get_RawUrl());
    Console.WriteLine("Query: {0}", request.get_QueryString());
    // Display the referring URI.
    Console.WriteLine("Referred by: {0}", request.get_UrlReferrer());
    //Display the HTTP method.
    Console.WriteLine("HTTP Method: {0}", request.get_HttpMethod());
    //Display the host information specified by the client;
    Console.WriteLine("Host name: {0}", request.get_UserHostName());
    Console.WriteLine("Host address: {0}", request.get_UserHostAddress());
    Console.WriteLine("User agent: {0}", request.get_UserAgent());
} //ShowRequestProperties1

Windows 98, Windows Server 2003, Windows XP Media Center Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0

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