header

 <?header name="..." value="..." [append="true|false"] [if="..."] [unless="..."] ?>

[since 5.0.2]

Specifies a response header. It has the same effect as the invocation of Execution.setResponseHeader(String, String).

name

Required

Specifies the name of the header, such as Pragma.

value

Required, EL allowed

Specifies the value of the header. The value could be an instance of string or Date (java.util.Date).

append

 Optional, EL allowed
 Default: false

Specifies whether to append a response header or to replace (aka., set). By default, it is false. It means the previous header with the same name will be replaced. If you want to append the value to the previous value, specify it to true.