method

expires_in

v1.0.0 - Show latest stable - Class: ActionController::Base

expires_in(seconds, options = {})

protected

Sets a HTTP 1.1 Cache-Control header. Defaults to issuing a "private" instruction, so that intermediate caches shouldn’t cache the response.

Examples:

  expires_in 20.minutes
  expires_in 3.hours, :private => false
  expires in 3.hours, 'max-stale' => 5.hours, :private => nil, :public => true

This method will overwrite an existing Cache-Control header. See http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html for more possibilities.

# File actionpack/lib/action_controller/base.rb, line 788
      def expires_in(seconds, options = {}) #:doc:
        cache_options = { 'max-age' => seconds, 'private' => true }.symbolize_keys.merge!(options.symbolize_keys)
        cache_options.delete_if { |k,v| v.nil? or v == false }
        cache_control = cache_options.map{ |k,v| v == true ? k.to_s : "#{k.to_s}=#{v.to_s}"}
        @response.headers["Cache-Control"] = cache_control.join(', ')
      end

1Note

'max-stale' should be sent by client, not by server

kuboon · Dec 12, 2014

3rd example is a trap.

expires_in

1Note

'max-stale' should be sent by client, not by server

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