Connection timeout: represents the send and receive timeout to all crawler sockets.
连接超时：代表了发送和接收所有爬虫套接字超时。
Is it possible to receive expiration or timeout exception when making a synchronous call?
当进行同步调用时，是否能够接收过期或超时异常？
Begins an asynchronous operation to receive an available request with a default timeout.
开始用于接收可用请求的异步操作，该操作具有默认的超时值。
Begins an asynchronous operation to receive an available request with a specified timeout.
开始用于接收可用请求的异步操作，该操作具有指定的超时值。
Begins an asynchronous operation to receive an available request with a specified timeout.
开始用于接收可用请求的异步操作，该操作具有指定的超时值。
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