每一个代理实例都会有个与之关联的调用处理器。

Each proxy instance has an associated invocation handler.

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当请求类型与正规表达式匹配时，就会调用处理器函数。

The handler function is called when the request type and the regular expression match.

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任何autocmd都可以由一个用逗号分隔的事件类型清单指定，这里所列出来的任一事件都能调用处理器。

Any autocmd can be specified with a comma-separated list of event types, in which case the handler will be invoked for any of the events listed.

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