public Flow runService(...) throws ... {
    [...]    

    Map params = getParameters(options);

    WSHttpServletRequestWrapper wRequest = retrieveWrappedServletRequest(sdf);

    setHttpSession(wRequest, sessionID);

    putParameters(wRequest,
                  (String[])params.get("names"),
                  (String[])params.get("values"),
                  (String[])params.get("attach"));

    // NEW PIECE OF CODE, I.E., THE PATCH
    wRequest.addParameter("_uri", serviceID);

    Node node = process(...);

    [...]

    return flow;
}