How to set a HTTP response header ?

Methods of the HttpServletResponse interface

• setHeader : sets a header with a given name and value
  If header name already exists, it will replace all the n existing values with 1 new value
• addHeader : adds a header value to a given name
• setIntHeader : sets a int type header
• setDateHeader : sets a Date type header
• addIntHeader : adds a int type header
• addDateHeader : adds a Date type header

* Headers must be set before the response is committed.