数据传输和类型转换在请求处理循环的两端发生。
Data transfer and type conversions happen on both ends of the request processing cycle.
但是，频繁的轮询在两端都需要带宽和资源来处理连接。
However, frequent polling requires bandwidth and resources on both sides to handle the connection.
所以，两端的发送方应该据此做好处理这种情况的准备。
So the sender in both sides should be prepared to handle that type of situation accordingly.
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