HttpListenerRequest.UrlReferrer 属性

定义

命名空间:

System.Net

程序集:

System.Net.HttpListener.dll

Source:

HttpListenerRequest.cs

获取将使客户端与服务器相关的资源的统一资源标识符 (URI)。

public:
 property Uri ^ UrlReferrer { Uri ^ get(); };

public Uri? UrlReferrer { get; }

member this.UrlReferrer : Uri

Public ReadOnly Property UrlReferrer As Uri

属性值

Uri

Uri 对象，包含请求的 Referer 标头的文本；如果请求中不包含标头，则为 null。

示例

下面的代码示例演示如何使用此属性。

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 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
    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
    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

注解

如果客户端跟踪了指向所请求 URI 的超链接，则其请求可能包含一个 Referrer 标头，用于标识包含超链接的资源的 URI。

客户端可以伪造或选择不显示 Referer 标头。 因此，虽然 UrlReferrer 属性可用于识别 Web 流量的基本趋势，但不应将其用作授权方案的一部分来控制对数据的访问。

有关请求标头的完整列表，请参阅 HttpRequestHeader 枚举。

UrlReferrer当请求中没有Referrer标头或标头存在于请求中但不分析为有效的 Uri时Referrer， 为 null。

另请参阅

• HttpListener
• HttpListenerContext
• HttpListenerResponse