Pound 是Web服务器的反向 HTTP 代理，负载均衡器和 HTTPS 前端。Poun能够在多个Web服务器之间分发负载，并能够为这些Web服务器提供一个便利的SSL封装。Pound可以是：    <ol>     <li>一个反向代理：it passes requests from client browsers to one or more back-end servers.</li>     <li>一个负载平衡器： it will distribute the requests from the client browsers among several back-end servers, while keeping session information.</li>     <li>一个SSL封装器：<em>Pound</em> will decrypt HTTPS requests from client browsers and pass them as plain HTTP to the back-end servers.</li>     <li>一个HTTP/HTTPS过滤器：<em>Pound</em> will verify requests for correctness and accept only well-formed ones.</li>     <li>一个故障转移服务器：should a back-end server fail, <em>Pound</em> will take note of the fact and stop passing requests to it until it recovers.</li>     <li>一个请求重定向：requests may be distributed among servers according to the requested URL.</li>    </ol>    <p><strong>项目主页：</strong><a href="http://www.open-open.com/lib/view/home/1325119329124" target="_blank">http://www.open-open.com/lib/view/home/1325119329124</a></p>