In this chapter, we delved deeper into the various components that form the Heroku platform. We understood the foundation of the Heroku platform, its stack, and how the currently supported Celadon Cedar provides different capabilities that help build and scale web apps seamlessly. We also looked at how user requests gets routed and finally executed in the Heroku execution environment. We briefly covered Heroku's Logplex logging infrastructure that helps trace the internal proceedings of your web app. We also looked at Heroku's add-on architecture that helps developers extend the Heroku platform and build newer capabilities for their apps. We learned how to programmatically execute Heroku operations by leveraging the Heroku Platform API and finally we reviewed the process architecture of Heroku—the single most important subsystem of the Heroku platform.

Now that we have the required foundational understanding of the Heroku platform, we will start learning how to build real, robust...