This way you can find the unexpected exceptions during the testing phase and address them in some manner more appropriate than a catch for all exception types.
这个方法在测试以及定位这些异常的时候，您可以找到这些意外的异常，总比接收所有异常类型要更加合适。
The next two lines allow users jack and jill to access the server from any location. The last line is a "catch-all" and denies everybody else access from every other address.
后两行允许用户 jack 和 jill 从任何地方访问服务器。
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