opMetaData.addParameter(paramMetaData);
paramMetaData.setInHeader(true);
paramMetaData.setIndex(1);
EndpointInvocation epInv = new EndpointInvocation(opMetaData);
epInv.initInputParams(new Object[]{"Hello World!", "IN header message"});
SOAPMessage reqMessage = (SOAPMessage)binding.bindRequestMessage(opMetaData, epInv, null);
ByteArrayOutputStream outs = new ByteArrayOutputStream();
reqMessage.writeTo(outs);