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HttpListenerResponse.AddHeader Method

Adds the specified header and value to the HTTP headers for this response.

Namespace:  System.Net
Assembly:  System (in System.dll)
public void AddHeader(
	string name,
	string value
)

Parameters

name
Type: System.String

The name of the HTTP header to set.

value
Type: System.String

The value for the name header.

ExceptionCondition
ArgumentNullException

name is null or an empty string ("").

ArgumentException

You are not allowed to specify a value for the specified header.

-or-

name or value contains invalid characters.

ArgumentOutOfRangeException

The length of value is greater than 65,535 characters.

Calling this method is equivalent to calling the Set method on the collection returned by the Headers property.

If the header specified in name does not exist, this method inserts a new header into the Headers property's collection. If name is present in the collection, this method replaces the existing value with value. To add a value to an existing header without replacing the existing value, use the AppendHeader method.

The following code example demonstrates adding a header using this property.

public static void SetExpirationDate(long seconds, HttpListenerResponse response)
{
    response.AddHeader("Expires", seconds.ToString());
}

.NET Framework

Supported in: 4.5.1, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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