HttpWebRequest.KeepAlive Özellik
Tanım
Önemli
Bazı bilgiler ürünün ön sürümüyle ilgilidir ve sürüm öncesinde önemli değişiklikler yapılmış olabilir. Burada verilen bilgilerle ilgili olarak Microsoft açık veya zımni hiçbir garanti vermez.
İnternet kaynağına kalıcı bir bağlantı yapılıp yapılmayacağını belirten bir değer alır veya ayarlar.
public:
property bool KeepAlive { bool get(); void set(bool value); };
public bool KeepAlive { get; set; }
member this.KeepAlive : bool with get, set
Public Property KeepAlive As Boolean
Özellik Değeri
true
İnternet kaynağına gönderilen istek Etkin tutma değerine sahip bir Connection
HTTP üst bilgisi içermelidir; aksi takdirde , false
. Varsayılan değer: true
.
Örnekler
Aşağıdaki kod örneği, İnternet kaynağıyla kalıcı bir bağlantı kurmaktan kaçınmak için özelliğini false
olarak ayarlarKeepAlive.
int main()
{
try
{
// Create a new HttpWebRequest object. Make sure that
// a default proxy is set if you are behind a firewall.
HttpWebRequest^ myHttpWebRequest1 = dynamic_cast<HttpWebRequest^>(WebRequest::Create( "http://www.contoso.com" ));
myHttpWebRequest1->KeepAlive = false;
// Assign the response object of HttpWebRequest to a HttpWebResponse variable.
HttpWebResponse^ myHttpWebResponse1 = dynamic_cast<HttpWebResponse^>(myHttpWebRequest1->GetResponse());
Console::WriteLine( "\nThe HTTP request Headers for the first request are: \n {0}", myHttpWebRequest1->Headers );
Console::WriteLine( "Press Enter Key to Continue.........." );
Console::Read();
Stream^ streamResponse = myHttpWebResponse1->GetResponseStream();
StreamReader^ streamRead = gcnew StreamReader( streamResponse );
array<Char>^readBuff = gcnew array<Char>(256);
int count = streamRead->Read( readBuff, 0, 256 );
Console::WriteLine( "The contents of the Html page are.......\n" );
while ( count > 0 )
{
String^ outputData = gcnew String( readBuff,0,count );
Console::Write( outputData );
count = streamRead->Read( readBuff, 0, 256 );
}
Console::WriteLine();
// Close the Stream object.
streamResponse->Close();
streamRead->Close();
// Release the resources held by response object.
myHttpWebResponse1->Close();
// Create a new HttpWebRequest object for the specified Uri.
HttpWebRequest^ myHttpWebRequest2 = dynamic_cast<HttpWebRequest^>(WebRequest::Create( "http://www.contoso.com" ));
myHttpWebRequest2->Connection = "Close";
// Assign the response object of 'HttpWebRequest' to a 'HttpWebResponse' variable.
HttpWebResponse^ myHttpWebResponse2 = dynamic_cast<HttpWebResponse^>(myHttpWebRequest2->GetResponse());
// Release the resources held by response object.
myHttpWebResponse2->Close();
Console::WriteLine( "\nThe Http RequestHeaders are \n {0}", myHttpWebRequest2->Headers );
Console::WriteLine( "\nPress 'Enter' Key to Continue........." );
Console::Read();
}
catch ( ArgumentException^ e )
{
Console::WriteLine( "\nThe second HttpWebRequest Object* has raised an Argument Exception as 'Connection' Property is set to 'Close'" );
Console::WriteLine( "\n {0}", e->Message );
}
catch ( WebException^ e )
{
Console::WriteLine( "WebException raised!" );
Console::WriteLine( "\n {0}", e->Message );
Console::WriteLine( "\n {0}", e->Status );
}
catch ( Exception^ e )
{
Console::WriteLine( "Exception raised!" );
Console::WriteLine( "Source : {0} ", e->Source );
Console::WriteLine( "Message : {0} ", e->Message );
}
}
class HttpWebRequest_Connection
{
static void Main()
{
try
{
// Create a new HttpWebRequest object.Make sure that
// a default proxy is set if you are behind a firewall.
HttpWebRequest myHttpWebRequest1 =
(HttpWebRequest)WebRequest.Create("http://www.contoso.com");
myHttpWebRequest1.KeepAlive=false;
// Assign the response object of HttpWebRequest to a HttpWebResponse variable.
HttpWebResponse myHttpWebResponse1 =
(HttpWebResponse)myHttpWebRequest1.GetResponse();
Console.WriteLine("\nThe HTTP request Headers for the first request are: \n{0}",myHttpWebRequest1.Headers);
Console.WriteLine("Press Enter Key to Continue..........");
Console.Read();
Stream streamResponse=myHttpWebResponse1.GetResponseStream();
StreamReader streamRead = new StreamReader( streamResponse );
Char[] readBuff = new Char[256];
int count = streamRead.Read( readBuff, 0, 256 );
Console.WriteLine("The contents of the Html page are.......\n");
while (count > 0)
{
String outputData = new String(readBuff, 0, count);
Console.Write(outputData);
count = streamRead.Read(readBuff, 0, 256);
}
Console.WriteLine();
// Close the Stream object.
streamResponse.Close();
streamRead.Close();
// Release the resources held by response object.
myHttpWebResponse1.Close();
// Create a new HttpWebRequest object for the specified Uri.
HttpWebRequest myHttpWebRequest2 =
(HttpWebRequest)WebRequest.Create("http://www.contoso.com");
myHttpWebRequest2.Connection="Close";
// Assign the response object of 'HttpWebRequest' to a 'HttpWebResponse' variable.
HttpWebResponse myHttpWebResponse2 =
(HttpWebResponse)myHttpWebRequest2.GetResponse();
// Release the resources held by response object.
myHttpWebResponse2.Close();
Console.WriteLine("\nThe Http RequestHeaders are \n{0}",myHttpWebRequest2.Headers);
Console.WriteLine("\nPress 'Enter' Key to Continue.........");
Console.Read();
}
catch(ArgumentException e)
{
Console.WriteLine("\nThe second HttpWebRequest object has raised an Argument Exception as 'Connection' Property is set to 'Close'");
Console.WriteLine("\n{0}",e.Message);
}
catch(WebException e)
{
Console.WriteLine("WebException raised!");
Console.WriteLine("\n{0}",e.Message);
Console.WriteLine("\n{0}",e.Status);
}
catch(Exception e)
{
Console.WriteLine("Exception raised!");
Console.WriteLine("Source :{0} " , e.Source);
Console.WriteLine("Message :{0} " , e.Message);
}
}
}
Class HttpWebRequest_Connection
Shared Sub Main()
Try
' Create a new 'HttpWebRequest' object for the specified Uri. Make sure that
' a default proxy is set if you are behind a firewall.
Dim myHttpWebRequest1 As HttpWebRequest = CType(WebRequest.Create("http://www.contoso.com"), HttpWebRequest)
myHttpWebRequest1.KeepAlive = False
' Assign the response object of 'HttpWebRequest' to a 'HttpWebResponse' variable.
Dim myHttpWebResponse1 As HttpWebResponse = CType(myHttpWebRequest1.GetResponse(), HttpWebResponse)
Console.WriteLine(ControlChars.Cr + "The HTTP request Headers for the first request are {0}", myHttpWebRequest1.Headers)
Console.WriteLine("Press Enter Key to Continue..........")
Console.Read()
Dim streamResponse As Stream = myHttpWebResponse1.GetResponseStream()
Dim streamRead As New StreamReader(streamResponse)
Dim readBuff(256) As [Char]
Dim count As Integer = streamRead.Read(readBuff, 0, 256)
Console.WriteLine("The contents of the Html page are......." + ControlChars.Cr)
While count > 0
Dim outputData As New [String](readBuff, 0, count)
Console.Write(outputData)
count = streamRead.Read(readBuff, 0, 256)
End While
' Close the Stream object.
streamResponse.Close()
streamRead.Close()
' Release the resources held by response object.
myHttpWebResponse1.Close()
Console.WriteLine()
' Create a new 'HttpWebRequest' object to the specified Uri.
Dim myHttpWebRequest2 As HttpWebRequest = CType(WebRequest.Create("http://www.contoso.com"), HttpWebRequest)
myHttpWebRequest2.Connection = "Close"
' Assign the response object of 'HttpWebRequest' to a 'HttpWebResponse' variable.
Dim myHttpWebResponse2 As HttpWebResponse = CType(myHttpWebRequest2.GetResponse(), HttpWebResponse)
' Release the resources held by response object.
myHttpWebResponse2.Close()
Console.WriteLine(ControlChars.Cr + "The Http RequestHeaders are " + ControlChars.Cr + "{0}", myHttpWebRequest2.Headers)
Console.WriteLine(ControlChars.Cr + "Press 'Enter' Key to Continue.........")
Console.Read()
Catch e As ArgumentException
Console.WriteLine(ControlChars.Cr + "The second HttpWebRequest object has raised an Argument Exception as 'Connection' Property is set to 'Close'")
Console.WriteLine(ControlChars.Cr + "{0}", e.Message)
Catch e As WebException
Console.WriteLine("WebException raised!")
Console.WriteLine(ControlChars.Cr + "{0}", e.Message)
Console.WriteLine(ControlChars.Cr + "{0}", e.Status)
Catch e As Exception
Console.WriteLine("Exception raised!")
Console.WriteLine("Source :{0} ", e.Source)
Console.WriteLine("Message : {0}", e.Message)
End Try
End Sub
End Class
Açıklamalar
Etkin tutma değerine sahip bir Connection
HTTP üst bilgisi göndermek için bu özelliği true
olarak ayarlayın. Bir uygulama, kalıcı bağlantılar için bir tercih belirtmek için kullanır KeepAlive . KeepAlive özelliği olduğundatrue
, uygulama bunları destekleyen sunucularla kalıcı bağlantılar kurar.
Not
HTTP/1.1 kullanırken Keep-Alive varsayılan olarak açıktır. ayarı KeepAlive , sunucuya false
üst Connection: Close
bilgi gönderilmesine neden olabilir.
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