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AuthenticationSchemeSelector Delegate

Selects the authentication scheme for an HttpListener instance.

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

'Declaration
Public Delegate Function AuthenticationSchemeSelector ( _
	httpRequest As HttpListenerRequest _
) As AuthenticationSchemes

Parameters

httpRequest
Type: System.Net.HttpListenerRequest

The HttpListenerRequest instance for which to select an authentication scheme.

Return Value

Type: System.Net.AuthenticationSchemes
One of the AuthenticationSchemes values that indicates the method of authentication to use for the specified client request.

Delegates of this type are used by HttpListener instances to select an authentication scheme based on the characteristics of a request.

An AuthenticationSchemeSelector delegate is passed an HttpListenerRequest object for each incoming request that has not provided authentication information. The method invoked by the delegate uses the HttpListenerRequest object and any other available information to decide which authentication scheme to require. The delegate is specified by using the AuthenticationSchemeSelectorDelegate property.

The following example uses an instance of this type to set the AuthenticationSchemeSelectorDelegate property.

' Set up a listener. 
Dim listener As New HttpListener()
Dim prefixes As HttpListenerPrefixCollection = listener.Prefixes
prefixes.Add("http://localhost:8080/")
prefixes.Add("http://contoso.com:8080/")

' Specify the authentication delegate.
listener.AuthenticationSchemeSelectorDelegate = New AuthenticationSchemeSelector(AddressOf AuthenticationSchemeForClient)

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

The following example shows the implementation of the method invoked by the AuthenticationSchemeSelector delegate in the previous example.

Private Shared Function AuthenticationSchemeForClient(ByVal request As HttpListenerRequest) As AuthenticationSchemes
    Console.WriteLine("Client authentication protocol selection in progress...")
    ' Do not authenticate local machine requests. 
    If request.RemoteEndPoint.Address.Equals(IPAddress.Loopback) Then 
        Return AuthenticationSchemes.None
    Else 
        Return AuthenticationSchemes.IntegratedWindowsAuthentication
    End If 
End Function

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
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