HttpWebRequest.MaximumResponseHeadersLength プロパティ

定義

応答ヘッダーの許容最大長を取得または設定します。Gets or sets the maximum allowed length of the response headers.

public:
 property int MaximumResponseHeadersLength { int get(); void set(int value); };
public int MaximumResponseHeadersLength { get; set; }
member this.MaximumResponseHeadersLength : int with get, set
Public Property MaximumResponseHeadersLength As Integer

プロパティ値

Int32

応答ヘッダーの長さ (KB 単位、1 KB = 1024 バイト)。The length, in kilobytes (1024 bytes), of the response headers.

例外

プロパティは、要求が送信された後に設定されます。The property is set after the request has already been submitted.

値は 0 より小さく、-1 とは異なっています。The value is less than 0 and is not equal to -1.

次のコード例では、このプロパティの値を設定します。The following code example sets the value of this property.

#using <System.dll>

using namespace System;
using namespace System::Net;
using namespace System::Text;
using namespace System::IO;

// Specify the URL to receive the request.
int main()
{
   array<String^>^args = Environment::GetCommandLineArgs();
   HttpWebRequest^ request = dynamic_cast<HttpWebRequest^>(WebRequest::Create( args[ 1 ] ));
   
   // Set some reasonable limits on resources used by this request
   request->MaximumAutomaticRedirections = 4;
   request->MaximumResponseHeadersLength = 4;
   
   // Set credentials to use for this request.
   request->Credentials = CredentialCache::DefaultCredentials;
   HttpWebResponse^ response = dynamic_cast<HttpWebResponse^>(request->GetResponse());
   Console::WriteLine( "Content length is {0}", response->ContentLength );
   Console::WriteLine( "Content type is {0}", response->ContentType );
   
   // Get the stream associated with the response.
   Stream^ receiveStream = response->GetResponseStream();
   
   // Pipes the stream to a higher level stream reader with the required encoding format. 
   StreamReader^ readStream = gcnew StreamReader( receiveStream,Encoding::UTF8 );
   Console::WriteLine( "Response stream received." );
   Console::WriteLine( readStream->ReadToEnd() );
   response->Close();
   readStream->Close();
}

/*
The output from this example will vary depending on the value passed into Main 
but will be similar to the following:

Content length is 1542
Content type is text/html; charset=utf-8
Response stream received.
<html>
...
</html>

*/
using System;
using System.Net;
using System.Text;
using System.IO;

    public class Test
    {
        // Specify the URL to receive the request.
        public static void Main (string[] args)
        {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create (args[0]);

            // Set some reasonable limits on resources used by this request
            request.MaximumAutomaticRedirections = 4;
            request.MaximumResponseHeadersLength = 4;
            // Set credentials to use for this request.
            request.Credentials = CredentialCache.DefaultCredentials;
            HttpWebResponse response = (HttpWebResponse)request.GetResponse ();

            Console.WriteLine ("Content length is {0}", response.ContentLength);
            Console.WriteLine ("Content type is {0}", response.ContentType);

            // Get the stream associated with the response.
            Stream receiveStream = response.GetResponseStream ();

            // Pipes the stream to a higher level stream reader with the required encoding format.
            StreamReader readStream = new StreamReader (receiveStream, Encoding.UTF8);

            Console.WriteLine ("Response stream received.");
            Console.WriteLine (readStream.ReadToEnd ());
            response.Close ();
            readStream.Close ();
        }
    }

/*
The output from this example will vary depending on the value passed into Main
but will be similar to the following:

Content length is 1542
Content type is text/html; charset=utf-8
Response stream received.
<html>
...
</html>

*/
Imports System.Net
Imports System.Text
Imports System.IO


    Public Class Test

        ' Specify the URL to receive the request.
        Public Shared Sub Main(ByVal args() As String)
        Dim request As HttpWebRequest = CType(WebRequest.Create(args(0)), HttpWebRequest)


        ' Set some reasonable limits on resources used by this request
        request.MaximumAutomaticRedirections = 4
        request.MaximumResponseHeadersLength = 4

        ' Set credentials to use for this request.
        request.Credentials = CredentialCache.DefaultCredentials

        Dim response As HttpWebResponse = CType(request.GetResponse(), HttpWebResponse)

        Console.WriteLine("Content length is {0}", response.ContentLength)
        Console.WriteLine("Content type is {0}", response.ContentType)

        ' Get the stream associated with the response.
        Dim receiveStream As Stream = response.GetResponseStream()

        ' Pipes the stream to a higher level stream reader with the required encoding format. 
        Dim readStream As New StreamReader(receiveStream, Encoding.UTF8)

        Console.WriteLine("Response stream received.")
        Console.WriteLine(readStream.ReadToEnd())
        response.Close()
        readStream.Close()
    End Sub
End Class
'
'The output from this example will vary depending on the value passed into Main 
'but will be similar to the following:
'
'Content length is 1542
'Content type is text/html; charset=utf-8
'Response stream received.
'...
'
'

注釈

応答ヘッダーの長さには、応答ステータス行、および HTTP プロトコルの一部として受信される追加の制御文字が含まれます。The length of the response header includes the response status line and any extra control characters that are received as part of HTTP protocol. 値-1 は、応答ヘッダーに制限が適用されないことを意味します。値0は、すべての要求が失敗することを意味します。A value of -1 means no limit is imposed on the response headers; a value of 0 means that all requests fail.

MaximumResponseHeadersLengthプロパティが明示的に設定されていない場合、プロパティの値が既定値に設定され DefaultMaximumResponseHeadersLength ます。If the MaximumResponseHeadersLength property is not explicitly set, it defaults to the value of the DefaultMaximumResponseHeadersLength property.

受信した応答ヘッダーの長さがプロパティの値を超えた場合 MaximumResponseHeadersLengthEndGetResponse メソッドまたはメソッドは、 GetResponse WebException プロパティがに設定されたをスローし Status MessageLengthLimitExceeded ます。If the length of the response header received exceeds the value of the MaximumResponseHeadersLength property, the EndGetResponse or GetResponse methods will throw a WebException with the Status property set to MessageLengthLimitExceeded.

適用対象