fresh_when

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

Parameters:

• :etag

• :last_modified

• :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).

Example:

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

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