标志在套接字读取或接收时出现延时。
Signals that a timeout has occurred on a socket read or accept.
这些异常完全没有任何意义，由 Web 层的客户机接收时尤其容易混淆。
These exceptions are fairly meaningless, and can be especially confusing when received by a client in the Web tier.
执行“输出过滤”，换句话说，当发回给浏览器时过滤用户数据，而不是当被脚本接收时。
By performing "output filtering," that is, filtering the user data when it is sent back to the browser, rather than when it is received by a script.
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