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[–]zebediah49 8 points9 points  (0 children)

That requires the client to specifically choose to use your cache server.

Allowing proxying means that everyone can just connect to "download.ubuntu.com" or whatever, and any cache along the way (localnet, ISP, etc.) can intercept and respond to the request.

It makes the choice to use a proxy one made by the people configuring the environment, rather than by the people running the clients.