反向Web服務器代理 Pound
Pound 是Web服務器的反向 HTTP 代理，負載均衡器和 HTTPS 前端。Poun能夠在多個Web服務器之間分發負載，并能夠為這些Web服務器提供一個便利的SSL封裝。Pound可以是：
- 一個反向代理：it passes requests from client browsers to one or more back-end servers.
- 一個負載平衡器： it will distribute the requests from the client browsers among several back-end servers, while keeping session information.
- 一個SSL封裝器：Pound will decrypt HTTPS requests from client browsers and pass them as plain HTTP to the back-end servers.
- 一個HTTP/HTTPS過濾器：Pound will verify requests for correctness and accept only well-formed ones.
- 一個故障轉移服務器：should a back-end server fail, Pound will take note of the fact and stop passing requests to it until it recovers.
- 一個請求重定向：requests may be distributed among servers according to the requested URL.
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