Take Control of Your HTTP Caching in Rails

The Rails fresh_when method is a powerful tool for conditionally caching resources via HTTP. However there are some pitfalls. For one, fresh_when only supports the default render flow in a controller; if a client’s cache is not fresh, it will just render the related view. We cannot utilize things like render json:. Fortunately, Rails provides us with more tools to work with HTTP conditional cachin

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“It will check if the resource’s updated_at has been modified since the timestamp provided by If-Modified-Since.”