最后，浏览器接收会话持续时间并设置一个超时以保持连接处于活跃状态。
Finally, the browser receives the session duration time and sets a timeout to keep the connection alive.
在应用程序级别上，当存在给定请求的预期响应，但此响应是异步接收的时候，超时又重新成为重要问题。
On an application level, however, timeouts come back into the picture when there is an expected response to a given request, but this response is received asynchronously.
当进行同步调用时，是否能够接收过期或超时异常？
Is it possible to receive expiration or timeout exception when making a synchronous call?
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