code: void abortResponse(Throwable cause) {
          isResponseAborted = true;
          // Try to close the request first, then abort the response if it is already closed.
          if (!tryClose(cause) &&
              response != null && !response.isComplete()) {
              response.abort();
          }
      }
docs: Aborts the {@link HttpResponse} which responds to this request if it exists.
  
  @see Http2RequestDecoder#onRstStreamRead(ChannelHandlerContext, int, long)