module ActionController::ConditionalGet

end
fresh_when(@article, :public => true)
@article = Article.find(params[:id])
def show

When passing a record, you can still set whether the public header:

end
fresh_when(@article)
@article = Article.find(params[:id])
def show

You can also just pass a record where last_modified will be set by calling updated_at and the etag by passing the object itself. Example:

If-Modified-Since header and just a 304 Not Modified response if there's a match.
This will render the show template if the request isn't sending a matching etag or

end
fresh_when(:etag => @article, :last_modified => @article.created_at, :public => true)
@article = Article.find(params[:id])
def show

Example:

* :public By default the Cache-Control header is private, set this to true if you want your application to be cachable by other devices (proxy caches).
* :last_modified
* :etag
Parameters:

304 Not Modified response if the request is already fresh.
Sets the etag, last_modified, or both on the response and renders a

def fresh_when(record_or_options, additional_options = {})
  if record_or_options.is_a? Hash
    options = record_or_options
    options.assert_valid_keys(:etag, :last_modified, :public)
  else
    record  = record_or_options
    options = { :etag => record, :last_modified => record.try(:updated_at) }.merge(additional_options)
  end
  response.etag          = options[:etag]          if options[:etag]
  response.last_modified = options[:last_modified] if options[:last_modified]
  response.cache_control[:public] = true if options[:public]
  head :not_modified if request.fresh?(response)
end