docs: private int getOparamCountFromRequest(HttpServletRequest pRequest) {
          // Use request.attribute for incrementing oparam counter
          Integer count = (Integer) pRequest.getAttribute(COUNTER);
          if (count == null) {
              count = new Integer(0);
          }
          else {
              count = new Integer(count.intValue() + 1);
          }
  
          // ... and set it back
          pRequest.setAttribute(COUNTER, count);
  
          return count.intValue();
      }