POX/REST http headers

[Marcin Kudla]

Hi

I use POX format for sending request by Apache Synapse to external REST
service
...
                <send>
                    <endpoint>
                        <address uri="http://any.address/"; format="pox"/>
                    </endpoint>
                </send>
...
and i want set http headers for this request.
I tried use <header> mediator but it not works. I think that <header>
mediator only set Soap headers, right ?
How can i set correctly headers for REST request ?
.