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From: Xavier Noria <fxn@hashref.com>
Date: Wed, 3 Dec 2014 13:42:16 +0100
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Subject: Re: No, passenger 5.0 is not faster than unicorn :)
To: unicorn-public <unicorn-public@bogomips.org>
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I've often found Cache-Control: public to be of limited use in practice
because you cannot invalidate that cache by hand. (Sometimes that's fine of
course.)

While the reverse proxy cache could provide a mechanism for explicit
expiration, there may be caches between your servers and the client, a
corporate cache for example. Those other ones are out of your control.

I suggested an extension for Rack::Cache called r-maxage that got merged:

    https://github.com/rtomayko/rack-cache/pull/55

With that directive you trade the benefits of caching in intermediate
proxies with more expiration control locally.