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HttpListener.AuthenticationSchemeSelectorDelegate Property

Gets or sets the delegate called to determine the protocol used to authenticate clients.

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

public AuthenticationSchemeSelector AuthenticationSchemeSelectorDelegate { get; set; }

Property Value

Type: System.Net.AuthenticationSchemeSelector
An AuthenticationSchemeSelector delegate that invokes the method used to select an authentication protocol. The default value is null.

ExceptionCondition
ObjectDisposedException

This object has been closed.

NoteNote

If you want the same authentication protocol to be used for all requests handled by a particular instance of HttpListener, you do not need to set this property. To specify a protocol to be used for all client requests, use the AuthenticationSchemes property.

If the client has not specified authentication information in its headers, the HttpListener calls the specified delegate for each unauthenticated incoming request to determine which, if any, protocol to use to authenticate the client. The GetContext and EndGetContext methods return an incoming request only if the HttpListener successfully authenticated the request. If a request cannot be authenticated, the HttpListener automatically sends back a 401 response. You can get the identity of a successfully authenticated client using the HttpRequest.LogonUserIdentity property.

The ability to delegate the choice of authentication protocol to an application-specific method is useful if you want an instance of HttpListener to use different authentication protocols depending on the characteristics of the requests it receives (for example, the request's Url or UserHostAddress property).

NoteNote

To set this property to enable Digest, NTLM, or Negotiate requires the SecurityPermission, ControlPrincipal.

The following code example sets the value of this property.

// Set up a listener.
HttpListener listener = new HttpListener();
HttpListenerPrefixCollection prefixes = listener.Prefixes;
prefixes.Add(@"http://localhost:8080/");
prefixes.Add(@"http://contoso.com:8080/");

// Specify the authentication delegate.
listener.AuthenticationSchemeSelectorDelegate = 
    new AuthenticationSchemeSelector (AuthenticationSchemeForClient);

// Start listening for requests and process them  
// synchronously.
listener.Start();

The following code example provides an implementation of a method invoked by an AuthenticationSchemeSelector delegate.

static AuthenticationSchemes AuthenticationSchemeForClient(HttpListenerRequest request)
{
    Console.WriteLine("Client authentication protocol selection in progress...");
    // Do not authenticate local machine requests. 
    if (request.RemoteEndPoint.Address.Equals (IPAddress.Loopback))
    {
        return AuthenticationSchemes.None;
    }
    else
    {
        return AuthenticationSchemes.IntegratedWindowsAuthentication;
    }
}

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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