How to set the expiration date for a FB Channel File in Rails 3

I am creating the channelfile for FB

cache_expire = 60*60*24*365
response.headers["Pragma"] = "public"
response.headers["Cache-Control"] = "max-age=#{cache_expire}"
response.headers["Expires"] = ... # gmdate('D, d M Y H:i:s', time()+$cache_expire) . ' GMT');

How do I set the "Expires" value in Rails 3?


 response.headers["Expires"] = + cache_expire).strftime("%D, %d %M % Y %H:%i:%s)

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