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http_conditional_get

⚡️ Turbo-Charge API Responses with Conditional GET (ETag & Last-Modified)​

Combine Rails’ HTTP caching with your JSON endpoints to avoid rendering or sending payloads when clients already have fresh data. Use stale? or fresh_when in controllers.

class ArticlesController < ApplicationController
  def show
    @article = Article.find(params[:id])
    fresh_when(etag: @article.cache_key_with_version, last_modified: @article.updated_at)
    # Rails returns 304 Not Modified if appropriate, skipping view/render
  end
end

You can also use expires_in and public: true to set Cache-Control headers for proxies and clients.