They accept HTTP requests, parse the URL, and forward processing of the request to an appropriate action.

它们接受HTTP请求，解析url，把请求的处理转发给适当的动作。

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If the base URL does not start with a forward slash, then it is assumed to be a relative URL, in which case the addition of a context name is unnecessary.

如果这个基本url不是以斜杠开始的，那么就认为它是一个相对url，这时就不必添加上下文名称。

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A forward proxy takes the request from the browser, looks at the URL, and forwards the request to the appropriate domain.

转发代理从浏览器获得请求，查看url，并将请求转发给合适的域。

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