I use the following route:

final String spurl = protocols.get(0).getEpUrl();
cc.addRoutes(new RouteBuilder()

{ public void configure() { from("direct:say") .setHeader(HttpConstants.HTTP_CONTENT_TYPE, constant("application/octet-stream")) .to(spurl); }

});

where "spurl" is the servlet URL endpoint. The messages are being sent to the servlet, but the content type in the "doPost(...)" is null.