public class WsHttpHeaderCallback implements WebServiceMessageCallback
{
    private String headerKey;
    private String headerValue;
    private String soapAction;

    public WsHttpHeaderCallback(String headerKey, String headerValue, String soapAction)
    {
        super();
        this.headerKey = headerKey;
        this.headerValue = headerValue;
        this.soapAction = soapAction;
    }

    public WsHttpHeaderCallback()
    {
        super();
    }

    @Override
    public void doWithMessage(WebServiceMessage message) throws IOException, TransformerException
    {
        validateRequiredFields();
        addRequestHeader(headerKey, headerValue);
        if (StringUtils.hasText(this.soapAction))
        {
            AxiomSoapMessage axiomMessage = (AxiomSoapMessage) message;
            axiomMessage.setSoapAction(this.soapAction);
        }
    }
    private void addRequestHeader(String headerKey, String headerValue)
    {
        TransportContext context = TransportContextHolder.getTransportContext();
        WebServiceConnection connection = context.getConnection();
        if (connection instanceof HttpComponentsConnection)
        {
            HttpComponentsConnection conn = (HttpComponentsConnection) connection;
            HttpPost post = conn.getHttpPost();
            post.addHeader(headerKey, headerValue);
        }
        else if( connection instanceof ClientHttpRequestConnection )
        {
            ClientHttpRequestConnection conn = (ClientHttpRequestConnection)connection;
            conn.getClientHttpRequest().getHeaders().add(headerKey, headerValue);
        }
    }
}

WebServiceResponse resp = (WebServiceResponse)webSvcTemplate.marshalSendAndReceive(wsUrl, request, new WsHttpHeaderCallback(headerKey, headerValue, "http://ws.com/soapAction") );