Gets the Uniform Resource Identifier (URI) of the resource that referred the client to the server.
Assembly: System (in System.dll)
Public ReadOnly Property UrlReferrer As Uripublic Uri UrlReferrer { get; }public:
property Uri^ UrlReferrer {
Uri^ get ();
}member UrlReferrer : Uri
Property Value
Type: SystemA Uri object that contains the text of the request's Referer header, or
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 basic 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 Shared Sub ShowRequestProperties1(ByVal request As HttpListenerRequest)
' Display the MIME types that can be used in the response.
Dim types() As String = request.AcceptTypes
If types IsNot Nothing Then
Console.WriteLine("Acceptable MIME types:")
For Each s As String In types
Console.WriteLine(s)
Next s
End If
' Display the language preferences for the response.
types = request.UserLanguages
If types IsNot Nothing Then
Console.WriteLine("Acceptable natural languages:")
For Each l As String In types
Console.WriteLine(l)
Next l
End If
' 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)
End Sub
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);
}
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.