func (c *client) OnTraffic(conn gnet.Conn) (action gnet.Action) {
	// c.log.Debug("response received")
	for {
		total := conn.InboundBuffered()
		if total < heartbeatRspLen {
			break
		}

		buf, _ := conn.Peek(total)
		// if it is a heartbeat response, skip it and read the next package
		if bytes.Equal(buf[:heartbeatRspLen], heartbeatRsp) {
			_, err := conn.Discard(heartbeatRspLen)
			if err != nil {
				c.metrics.incError(errConnReadFailed.getStrCode())
				c.log.Error("discard connection stream failed, err", err)
				// read failed, close the connection
				return gnet.Close
			}

			c.log.Debug("heartbeat rsp receive")
			continue
		}

		length, payloadOffset, payloadOffsetEnd, err := c.framer.ReadFrame(buf)
		if errors.Is(err, framer.ErrIncompleteFrame) {
			break
		}

		if err != nil {
			c.metrics.incError(errConnReadFailed.getStrCode())
			c.log.Error("invalid packet from stream connection, close it, err:", err)
			// read failed, close the connection
			return gnet.Close
		}

		frame, _ := conn.Peek(length)
		_, err = conn.Discard(length)                                                         // discard will release the buffer and it can be written again
		if err != nil {
			c.metrics.incError(errConnReadFailed.getStrCode())
			c.log.Error("discard connection stream failed, err", err)
			// read failed, close the connection
			return gnet.Close
		}

		// handle response
		c.onResponse(frame[payloadOffset:payloadOffsetEnd])               // handle the response here, but the frame may be truncated
	}
	return gnet.None
}