Provides a simple, programmatically controlled HTTP protocol listener. This class cannot be inherited.
Assembly: System (in System.dll)
Thetype exposes the following members.
|AuthenticationSchemes||Gets or sets the scheme used to authenticate clients.|
|AuthenticationSchemeSelectorDelegate||Gets or sets the delegate called to determine the protocol used to authenticate clients.|
|DefaultServiceNames||Gets a default list of Service Provider Names (SPNs) as determined by registered prefixes.|
|ExtendedProtectionPolicy||Get or set the ExtendedProtectionPolicy to use for extended protection for a session.|
|ExtendedProtectionSelectorDelegate||Get or set the delegate called to determine the ExtendedProtectionPolicy to use for each request.|
|IgnoreWriteExceptions||Gets or sets a Boolean value that specifies whether your application receives exceptions that occur when an sends the response to the client.|
|IsListening||Gets a value that indicates whether has been started.|
|IsSupported||Gets a value that indicates whether can be used with the current operating system.|
|Prefixes||Gets the Uniform Resource Identifier (URI) prefixes handled by this object.|
|Realm||Gets or sets the realm, or resource partition, associated with this object.|
|UnsafeConnectionNtlmAuthentication||Gets or sets a Boolean value that controls whether, when NTLM is used, additional requests using the same Transmission Control Protocol (TCP) connection are required to authenticate.|
|Abort||Shuts down the object immediately, discarding all currently queued requests.|
|BeginGetContext||Begins asynchronously retrieving an incoming request.|
|Close||Shuts down the .|
|EndGetContext||Completes an asynchronous operation to retrieve an incoming client request.|
|Equals(Object)||Determines whether the specified Object is equal to the current Object. (Inherited from Object.)|
|Finalize||Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)|
|GetContext||Waits for an incoming request and returns when one is received.|
|GetHashCode||Serves as a hash function for a particular type. (Inherited from Object.)|
|GetType||Gets the Type of the current instance. (Inherited from Object.)|
|MemberwiseClone||Creates a shallow copy of the current Object. (Inherited from Object.)|
|Start||Allows this instance to receive incoming requests.|
|Stop||Causes this instance to stop receiving incoming requests.|
|ToString||Returns a string that represents the current object. (Inherited from Object.)|
Using the class, you can create a simple HTTP protocol listener that responds to HTTP requests. The listener is active for the lifetime of the object and runs within your application with its permissions.
This class is available only on computers running the Windows XP SP2 or Windows Server 2003 operating systems. If you attempt to create an object on a computer that is running an earlier operating system, the constructor throws a PlatformNotSupportedException exception.
To use , create a new instance of the class using the constructor and use the Prefixes property to gain access to the collection that holds the strings that specify which Uniform Resource Identifier (URI) prefixes the should process.
A URI prefix string is composed of a scheme (http or https), a host, an optional port, and an optional path. An example of a complete prefix string is "http://www.contoso.com:8080/customerData/". Prefixes must end in a forward slash ("/"). The object with the prefix that most closely matches a requested URI responds to the request. Multiple objects cannot add the same prefix; a Win32Exception exception is thrown if a adds a prefix that is already in use.
When a port is specified, the host element can be replaced with "*" to indicate that the accepts requests sent to the port if the requested URI does not match any other prefix. For example, to receive all requests sent to port 8080 when the requested URI is not handled by any , the prefix is "http://*:8080/". Similarly, to specify that the accepts all requests sent to a port, replace the host element with the "+" character, "https://+:8080". The "*" and "+" characters can be present in prefixes that include paths.
To begin listening for requests from clients, add the URI prefixes to the collection and call the Start method. offers both synchronous and asynchronous models for processing client requests. Requests and their associated responses are accessed using the HttpListenerContext object returned by the GetContext method or its asynchronous counterparts, the BeginGetContext and EndGetContext methods.
The synchronous model is appropriate if your application should block while waiting for a client request and if you want to process only one request at a time. Using the synchronous model, call the GetContext method, which waits for a client to send a request. The method returns an HttpListenerContext object to you for processing when one occurs.
In the more complex asynchronous model, your application does not block while waiting for requests and each request is processed in its own execution thread. Use the BeginGetContext method to specify an application-defined method to be called for each incoming request. Within that method, call the EndGetContext method to obtain the request, process it, and respond.
In either model, incoming requests are accessed using the HttpListenerContext::Request property and are represented by HttpListenerRequest objects. Similarly, responses are accessed using the HttpListenerContext::Response property and are represented by HttpListenerResponse objects. These objects share some functionality with the HttpWebRequest and HttpWebResponse objects, but the latter objects cannot be used in conjunction with because they implement client, not server, behaviors.
An can require client authentication. You can either specify a particular scheme to use for authentication, or you can specify a delegate that determines the scheme to use. You must require some form of authentication to obtain information about the client's identity. For additional information, see the User, AuthenticationSchemes, and AuthenticationSchemeSelectorDelegate properties.
If you create an using https, you must select a Server Certificate for that listener. Otherwise, an HttpWebRequest query of this will fail with an unexpected close of the connection.
You can configure Server Certificates and other listener options by using HttpCfg.exe. See http://msdn.microsoft.com/library/default.asp?url=/library/en-us/http/http/httpcfg_exe.asp for more details. The executable is shipped with Windows Server 2003, or can be built from source code available in the Platform SDK.
If you specify multiple authentication schemes for the , the listener will challenge clients in the following order: Negotiate, NTLM, Digest, and then Basic.
Windows Server 2003 Platform Note: Is required to use this class.
Windows XP Home Edition, Windows XP Professional x64 Edition, Windows Server 2003 Platform Note: Service Pack 2 or later is required to use this class
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.