HTTP response header

[Subil Abraham]

The javax.servlet.http.HTTPServletResponse interface provides a setHeader(String header, String value) and an addHeader(String header, String value) method.
Is there any difference between these two methods or do they provide the same functionality ?
Thanks
Subil

[Jason Qiu]

addDateHeader, addHeader, addIntHeader
will always add a response header with the given name and integer value. This method allows response headers to have multiple values.
you can then use
request.getHeaders(name) to retrieve the muliple values of one header name.
setHeader, setDateHeader, setIntHeader
set a response header with the given name and value. If the header had already been set, the new value overwrites the previous one.
you can use
request.getHeader(name) to retrieve the single values of the header name.