There are 3 squid releases in squid's official website: 2.7, 3.0 and 3.1.
I am confused, which one should I choose?
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Depends on your use case. There are a number of features that exist in 2.7 and not yet in 3.x because they were in part developed in parallel. I'd start reading at the Squid 2.7 link and compare on the functionality you need. One of the reasons I've stuck with 2.7 is because of StaleWhileRevalidate but most users are looking more for controlling content and 3.x tends to do that better.