Correct phase to rewrite the http-header field Host

[Alex Declent]

Hi,

in my server setup I use iptables to set the source ip address of my 
outgoing client requests
from a fake ip adresse to the correct one.
The remote service requires the domain name (example.com) as http-header 
host field,
and some extra http-header fields.
Well, I decided to use an interceptor:

public class HttpHeaderInterceptor extends 
AbstractPhaseInterceptor<Message> {
    private String userId;
    private String xAuthorizeRoles;
    private String host;

public HttpHeaderInterceptor() {
    super(Phase.POST_PROTOCOL);
}

@Override
public void handleMessage(Message message) throws Fault {
    Map<String, List> headers = (Map<String, List>) 
message.get(Message.PROTOCOL_HEADERS);
    try {
        headers.put("Host", Collections.singletonList(host));
        headers.put("USERID", Collections.singletonList(userId));
        headers.put("X-AUTHORIZE-roles", 
Collections.singletonList(xAuthorizeRoles));
    } catch (Exception ce) {
         throw new Fault(ce);
    }
}


A tcpdump shows that the header field host doesn’t contains the domain 
name, but the other fields
are set correctly.

I tried different phases to add my interceptor into the outgoing chain, 
without success.

Is there a possibility to set the http-header field host, if yes on 
which phase
I have to set it?

Thanks, Alex