You publish your content on an ordinary Web server, then connect it to your PURL with HTTP redirection.
可以将内容发布在普通的Web服务器上，然后用http重定向连接到PURL。
The indirection from PURLs to less-persistent HTTP URIs is much like the indirection provided by DNS, except that the source and the destination of the redirection are in the same category.
从 PURL 到持久性较底的 HTTP URI，这种的间接性和 DNS 提供的间接性非常相似，只要重定向的来源和目的不在同一类别中即可。
Perform the redirection without requiring another HTTP request to be sent to the web server.
执行重定向，但不需要发送另一个HTTP请求到web服务器。
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