code: private void releaseHttpRequest(HttpServletRequestEvent hreqEvent) {
          if (tracer.isFinestEnabled()) {
              tracer.finest("releaseHttpRequest() enter");
          }
  
          final Object lock = requestLock.removeLock(hreqEvent);
          if (lock != null) {
              synchronized (lock) {
                  lock.notify();
              }
          }
  
          if (tracer.isFineEnabled()) {
              tracer.fine("released lock for http request " + hreqEvent.getId());
          }
      }
docs: Allows control to be returned back to the servlet conainer, which delivered the http request. The container will
  mandatory close the response stream.