expires_in(seconds, options = {})
Instance Public methods
Sets a HTTP 1.1 Cache-Control header. Defaults to issuing a
private instruction, so that intermediate caches must not
cache the response.
expires_in 20.minutes
expires_in 3.hours, public: true
expires_in 3.hours, public: true, must_revalidate: true
This method will overwrite an existing Cache-Control header. See www.w3.org/Protocols/rfc2616/rfc2616-sec14.html
for more possibilities.
The method will also ensure a HTTP Date h