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HttpWebRequest.Headers Property

Specifies a collection of the name/value pairs that make up the HTTP headers.

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

public override function get Headers () : WebHeaderCollection 
public override function set Headers (value : WebHeaderCollection)

Property Value

Type: System.Net.WebHeaderCollection
A WebHeaderCollection that contains the name/value pairs that make up the headers for the HTTP request.

ExceptionCondition
InvalidOperationException

The request has been started by calling the GetRequestStream, BeginGetRequestStream, GetResponse, or BeginGetResponse method.

The Headers collection contains the protocol headers associated with the request. The following table lists the HTTP headers that are not stored in the Headers collection but are either set by the system or set by properties or methods.

Header

Set by

Accept

Set by the Accept property.

Connection

Set by the Connection property and KeepAlive property.

Content-Length

Set by the ContentLength property.

Content-Type

Set by the ContentType property.

Expect

Set by the Expect property.

Date

Set by the system to the current date.

Host

Set by the system to the current host information.

If-Modified-Since

Set by the IfModifiedSince property.

Range

Set by the AddRange method.

Referer

Set by the Referer property.

Transfer-Encoding

Set by the TransferEncoding property (the SendChunked property must be true).

User-Agent

Set by the UserAgent property.

The Add method throws an ArgumentException if you try to set one of these protected headers.

Changing the Headers property after the request has been started by calling GetRequestStream, BeginGetRequestStream, GetResponse, or BeginGetResponse method throws an InvalidOperationException.

You should not assume that the header values will remain unchanged, because Web servers and caches may change or add headers to a Web request.

The following code example uses the Headers property to print the HTTP header name/value pairs to the console.

No code example is currently available or this language may not be supported.
// Create a new 'HttpWebRequest' Object to the mentioned URL.
HttpWebRequest* myHttpWebRequest =
   dynamic_cast<HttpWebRequest*>(WebRequest::Create(S"http://www.contoso.com"));
// Assign the response object of 'HttpWebRequest' to a 'HttpWebResponse' variable.
HttpWebResponse* myHttpWebResponse =
   dynamic_cast<HttpWebResponse*>(myHttpWebRequest->GetResponse());
Console::WriteLine(S"\nThe HttpHeaders are \n\n\tName\t\tValue\n {0}",
   myHttpWebRequest->Headers);
// Print the HTML contents of the page to the console.
Stream* streamResponse = myHttpWebResponse->GetResponseStream();
StreamReader* streamRead = new StreamReader(streamResponse);
Char readBuff[] = new Char[256];
int count = streamRead->Read(readBuff, 0, 256);
Console::WriteLine(S"\nThe HTML contents of page the are  : \n\n ");
while (count > 0) {
   String* outputData = new String(readBuff, 0, count);
   Console::Write(outputData);
   count = streamRead->Read(readBuff, 0, 256);
}
// Close the Stream object.
streamResponse->Close();
streamRead->Close();
// Release the HttpWebResponse Resource.
myHttpWebResponse->Close();

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

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