dap4/d4servlet/src/main/java/dap4/servlet/DapController.java
protected DapRequest
    getRequestState(HttpServletRequest rq, HttpServletResponse rsp)
            throws IOException
    {
        return new DapRequest(this, rq, rsp);
    }
protected DapRequest
    getRequestState(HttpServletRequest rq, HttpServletResponse rsp)
            throws IOException
    {
        return new DapRequest(this, rq, rsp);
    }
Merge the servlet inputs into a single object
for easier transport as well as adding value.

@param rq  A Servlet request object
@param rsp A Servlet response object
@return the union of the
servlet request and servlet response arguments
from the servlet engine.