ASP AddHeader Method

The ASP AddHeader Method is used to specify for adding a new named for the HTTP Header and provide and given a value to the HTTP Response. It is a method of a Response type Object. 

• Once a header has been added then it can not be further removed.
• This method must be called before any output is sent to the client unless the Response. Buffer is set to true.

Syntax:

response.AddHeader name,value

 Parameter Values: This method accepts two parameters as mentioned above and described below:

• name: It defines the name of the new header variable. The name cannot contain any underscores (_).
• value: It defines the initial value of the new header variable.

 Return Values: This method has not returned any value. 

 Example 1:

<% Response.AddHeader "WARNING","Error message text %>

Example 2: Below code uses the AddHeader method to request that the client use Basic authentication.

<% Response.Addheader "WWW-Authenticate", "BASIC" %>

Example 3:  

<% Response.AddHeader "CustomHeader", "CustomValue" %>

Reference: https://docs.microsoft.com/en-us/previous-versions/iis/6.0-sdk/ms524327(v=vs.90)