code: @Nonnull
    @OverrideOnDemand
    public EContinue onFilterBefore (@Nonnull final HttpServletRequest aHttpRequest,
                                     @Nonnull final HttpServletResponse aHttpResponse,
                                     @Nonnull final IRequestWebScope aRequestScope) throws IOException, ServletException
    {
      // By default continue
      return EContinue.CONTINUE;
    }
docs: Invoked before the rest of the request is processed.
  
  @param aHttpRequest
  The HTTP request. Never <code>null</code>.
  @param aHttpResponse
  The HTTP response. Never <code>null</code>.
  @param aRequestScope
  Current request scope. Never <code>null</code>.
  @return {@link EContinue#CONTINUE} to continue processing the request,
  {@link EContinue#BREAK} otherwise.
  @throws IOException
  In case of IO error
  @throws ServletException
  In case of business level error