code: public static RequestLimitingHandler requestLimitingHandler(final int maxRequest, final int queueSize, HttpHandler next) {
          return new RequestLimitingHandler(maxRequest, queueSize, next);
      }
docs: Returns a handler that limits the maximum number of requests that can run at a time.
  
  @param maxRequest The maximum number of requests
  @param queueSize  The maximum number of queued requests
  @param next       The next handler
  @return           The handler