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.NET Development
.NET Framework 3.5
HttpRequest Class
 Headers Property

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This page is specific to
Microsoft Visual Studio 2008/.NET Framework 3.5

Other versions are also available for the following:
.NET Framework Class Library
HttpRequest..::.Headers Property

Gets a collection of HTTP headers.

Namespace:  System.Web
Assembly:  System.Web (in System.Web.dll)
Visual Basic (Declaration)
Public ReadOnly Property Headers As NameValueCollection
Visual Basic (Usage)
Dim instance As HttpRequest
Dim value As NameValueCollection

value = instance.Headers
C#
public NameValueCollection Headers { get; }
Visual C++
public:
property NameValueCollection^ Headers {
    NameValueCollection^ get ();
}
JScript
public function get Headers () : NameValueCollection

For a listing of all possible headers, see Request Header Fields on the W3C Web site.

The following code example displays the names and values of all headers in the HTTP request.

Visual Basic
Dim loop1, loop2 As Integer
 Dim arr1(), arr2() As String
 Dim coll As NameValueCollection


' Load Header collection into NameValueCollection object.
coll=Request.Headers

' Put the names of all keys into a string array.
arr1 = coll.AllKeys 
For loop1 = 0 To arr1.GetUpperBound(0)
   Response.Write("Key: " & arr1(loop1) & "<br>")
   arr2 = coll.GetValues(loop1) 
   ' Get all values under this key.
   For loop2 = 0 To arr2.GetUpperBound(0)
      Response.Write("Value " & CStr(loop2) & ": " & Server.HtmlEncode(arr2(loop2)) & "<br>")
    Next loop2
 Next loop1


C#
int loop1, loop2;
NameValueCollection coll;

// Load Header collection into NameValueCollection object.
coll=Request.Headers;

// Put the names of all keys into a string array.
String[] arr1 = coll.AllKeys; 
for (loop1 = 0; loop1<arr1.Length; loop1++) 
{
   Response.Write("Key: " + arr1[loop1] + "<br>");
   // Get all values under this key.
   String[] arr2=coll.GetValues(arr1[loop1]);
   for (loop2 = 0; loop2<arr2.Length; loop2++) 
   {
      Response.Write("Value " + loop2 + ": " + Server.HtmlEncode(arr2[loop2]) + "<br>");
   }
}


JScript
var arr1, arr2 : String[]
var coll : NameValueCollection

coll=Request.Headers  // Load Header collection into NameValueCollection object.
arr1 = coll.AllKeys   // Put names of all keys into a string array.
for(var i=0; i < arr1.Length; i++){
  Response.Write("Key: " + arr1[i] + "<br>")
  arr2 = coll.GetValues(i) // Get all values under this key.
  for(var j=0; j < arr2.Length; j++){
      Response.Write("Value " + j + ": " + Server.HtmlEncode(arr2[j]) + "<br>")
  }
}


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

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
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PlatformNotSupported exception when using Request.Headers.Add on Win2k3      Tess1   |   Edit   |   Show History

After installing the following security update http://support.microsoft.com/kb/928365/ Request.Headers.Add on Windows 2003 will fail with a PlatformNotSupportedException

[PlatformNotSupportedException: Operation is not supported on this platform.]

System.Web.HttpHeaderCollection.Add(String name, String value) +2683180

HelloWorldModule.context_BeginRequest(Object sender, EventArgs e) +79

System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +68

System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +75

This is because this is only supported on the IIS7 platform.

An alternative way of setting the headers in BeginRequest of an HTTPModule can be found in the comments of the following blog

http://bigjimindc.blogspot.com/2007/07/ms-kb928365-aspnet-requestheadersadd.html

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PlatformNotSupported exception when using Request.Headers.Add on Win2k3      Tess1   |   Edit   |   Show History
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PlatformNotSupported exception when using Request.Headers.Add on Win2k3      Tess1   |   Edit   |   Show History
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PlatformNotSupported exception when using Request.Headers.Add on Win2k3      Tess1   |   Edit   |   Show History
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