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In Ruby-land, <a href="http://rack.github.io/" target="_blank">Rack</a> can be compared to Node.js’ excellent <a href="https://expressjs.com/" target="_blank">express </a>web server. However, its approach is a little bit different. While Express is a full web server, Rack only gives you the building blocks to roll your own. Since most Ruby web servers are built on Rack, we can use them to power our GraphQL server in no time.