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I am currently running Ubuntu 12.04. How would I go about caching all downloads? And if Linux does not have this built in, then what are good tools for this?

Please note that this isn't a browser related question, I want any program attempting to access the net to retrieve cached data instead. Also, I am not running a server; I want to do this with a single home PC.

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This sounds very difficult or impossible do to for "all internet downloads", although it should be possible if you limit your scope (ie. only http requests) –  lk- Aug 22 '12 at 19:15
    
@lk I'm aiming at caching http and apt-get requests –  aggregate1166877 Aug 22 '12 at 19:26
    
I found a program named apt-proxy. Its purpose is specifically to cache apt downloads on a network. It can be found here –  aggregate1166877 Aug 12 '13 at 7:34

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up vote 3 down vote accepted

I think you are looking for a caching web proxy like polipo or squid. Although it's called a proxy-server you don't need a separate system to run it. It just means that it is a special software that can serve a client a particular service (In this case caching already downloaded data). A client is also a software that can run on the same system as the server or request the service remotely.

In your case i recommend polipo. You can find it in the ubuntu repository. Just install it and set the proxy-server in your browser settings to

localhost:8123

of course you can request data with other software than a browser over the proxy, too.

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I tried polipo, and it works like a charm. Thanks :) –  aggregate1166877 Aug 22 '12 at 19:54

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