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HttpListenerResponse.KeepAlive Property

Gets or sets a value indicating whether the server requests a persistent connection.

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

public:
property bool KeepAlive {
	bool get ();
	void set (bool value);
}
/** @property */
public boolean get_KeepAlive ()

/** @property */
public void set_KeepAlive (boolean value)

public function get KeepAlive () : boolean

public function set KeepAlive (value : boolean)

Not applicable.

Property Value

true if the server requests a persistent connection; otherwise, false. The default is true.

Exception typeCondition

ObjectDisposedException

This object is closed.

If an HTTP client and server expect to exchange data multiple times in a short period, a persistent connection speeds up their communications by allowing them to avoid the overhead required to open and close a TCP connection for each message. Persistent connections are in widespread use in communications between modern Web browsers and Web servers.

Persistent connections are described in detail in the HTTP/1.1 protocol specification (RFC 2616) available at the RTF Editor Web site (http://www.rfc-editor.org).

The following code example demonstrates setting the value of this property.


// When the client is not authenticated, there is no Identity.
if (context.User == null)
{
    message.Append ("<HTML><BODY><p> Hello local user! </p></BODY></HTML>");
}
else
{
    // Get the requester's identity.
    System.Security.Principal.WindowsIdentity identity = WindowsIdentity.GetCurrent();
    // Construct the response body.
    message.AppendFormat ("<HTML><BODY><p> Hello {0}!<br/>", 
        identity.Name);
    message.AppendFormat ("You were authenticated using {0}.</p>", 
        identity.AuthenticationType);
    message.Append ("</BODY></HTML>");
}

// Configure the response.
HttpListenerResponse response = context.Response;

// Use the encoding from the response if one has been set.
// Otherwise, use UTF8.
System.Text.Encoding encoding = response.ContentEncoding;
if (encoding == null)
{
    encoding = System.Text.Encoding.UTF8;
    response.ContentEncoding = encoding;
}
byte[] buffer = encoding.GetBytes (message.ToString ());
response.ContentLength64 = buffer.Length;
response.StatusCode = (int) HttpStatusCode.OK;
response.StatusDescription = "OK";
response.ProtocolVersion = new Version ("1.1");
// Don't keep the TCP connection alive; 
// We don't expect multiple requests from the same client.
response.KeepAlive = false;
// Write the response body.
System.IO.Stream stream = response.OutputStream;
stream.Write(buffer, 0, buffer.Length);

Windows 98, Windows Server 2003, Windows XP Media Center Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0

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