Подготовлен альтернативный репозиторий с исходными кодами Red Hat Enterprise Linux

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Proxy Redirection Methods

So far, we have talked about general redirection methods. Content also may need to be accessed through various proxies (potentially for security reasons), or there might be a proxy cache in the network that a client should take advantage of (because it likely will be much faster to retrieve the cached content than it would be to go directly to the origin server).

But how do clients such as web browsers know to go to a proxy? There are three ways to determine this: by explicit browser configuration, by dynamic automatic configuration, and by transparent interception. We will discuss these three techniques in this section.

A proxy can, in turn, redirect client requests to a different proxy. For example, a proxy cache that does not have the content in its cache may choose to redirect the client to another cache. As this results in the response coming from a location different from the one from which the client requested the resource, we also will discuss several protocols used for peer proxy-cache redirection: the Internet Cache Protocol (ICP), the Cache Array Routing Protocol (CARP), and the Hyper Text Caching Protocol (HTCP). 

Заменили своими пакетами с выпиленным systemd только около четырехсот оригинальных пакетов Debian из около 60K (общее количество пакетов в Debian), которые, как я понимаю, проксируются каким-то способом в первозданном бинарном виде прямиком из реп Debian.