HttpWebRequest.KeepAlive プロパティとは何？わかりやすく解説 Weblio辞書

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.NET Framework クラスライブラリリファレンス

索引トップ用語の索引ランキング

HttpWebRequest.KeepAlive プロパティ

インターネットリソースへの永続的な接続を行うかどうかを示す値を取得または設定します。

名前空間: System.Net
アセンブリ: System (system.dll 内)
構文

Visual Basic (宣言)

Public Property KeepAlive As
 Boolean

Visual Basic (使用法)

Dim instance As HttpWebRequest
Dim value As Boolean

value = instance.KeepAlive

instance.KeepAlive = value

public bool KeepAlive { get;
 set; }

C++

public:
property bool KeepAlive {
    bool get ();
    void set (bool value);
}

/** @property */
public boolean get_KeepAlive ()

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

JScript

public function get KeepAlive
 () : boolean

public function set KeepAlive
 (value : boolean)

プロパティ値
インターネットリソースへの要求に、値 Keep-alive を持つ Connection HTTP ヘッダーを格納する場合は true。それ以外の場合は false。既定値は true です。

解説

値 Keep-alive を持つ Connection HTTP ヘッダーを送信するには、このプロパティを true に設定します。アプリケーションは KeepAlive を使用して、永続的な接続への設定を示します。KeepAlive プロパティが true の場合、アプリケーションは対応しているサーバーに対して永続的な接続を行います。

メモ
HTTP/1.1 を使用する場合、Keep-alive は既定でオンになっています。KeepAlive を false に設定すると、Connection: Close ヘッダーがサーバーに送信されることがあります。

使用例

KeepAlive プロパティを false に設定して、インターネットリソースとの永続的な接続が確立されないようにするコード例を次に示します。

Visual Basic

Imports System
Imports System.IO
Imports System.Net
Imports System.Text
Imports Microsoft.VisualBasic

using System;
using System.IO;
using System.Net;
using System.Text;

C++

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
{
    public static void main(String[]
 args)
    {
        try {
            // Create a new HttpWebRequest object.Make sure that 
            // a default proxy is set if you are behind a fure wall.
            HttpWebRequest myHttpWebRequest1 = (HttpWebRequest)
                (WebRequest.Create("http://www.contoso.com"));
            myHttpWebRequest1.set_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.get_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.set_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.get_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.get_Message());
        }
        catch (WebException e) {
            Console.WriteLine("WebException raised!");
            Console.WriteLine("\n{0}", e.get_Message());
            Console.WriteLine("\n{0}", e.get_Status());
        }
        catch (System.Exception e) {
            Console.WriteLine("Exception raised!");
            Console.WriteLine("Source :{0} ", e.get_Source());
            Console.WriteLine("Message :{0} ", e.get_Message());
        }
    } //main
} //HttpWebRequest_Connection

import System.*;
import System.IO.*;
import System.Net.*;
import System.Text.*;

class HttpWebRequest_Connection
{
    public static void main(String[]
 args)
    {
        try {
            // Create a new HttpWebRequest object.Make sure that 
            // a default proxy is set if you are behind a fure wall.
            HttpWebRequest myHttpWebRequest1 = (HttpWebRequest)
                (WebRequest.Create("http://www.contoso.com"));
            myHttpWebRequest1.set_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.get_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.set_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.get_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.get_Message());
        }
        catch (WebException e) {
            Console.WriteLine("WebException raised!");
            Console.WriteLine("\n{0}", e.get_Message());
            Console.WriteLine("\n{0}", e.get_Status());
        }
        catch (System.Exception e) {
            Console.WriteLine("Exception raised!");
            Console.WriteLine("Source :{0} ", e.get_Source());
            Console.WriteLine("Message :{0} ", e.get_Message());
        }
    } //main
} //HttpWebRequest_Connection

プラットフォーム

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。

バージョン情報

.NET Framework
サポート対象 : 2.0、1.1、1.0
.NET Compact Framework
サポート対象 : 2.0、1.0

参照

関連項目
HttpWebRequest クラス
HttpWebRequest メンバ
System.Net 名前空間

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