Dispatching Requests to Controllers
At its simplest, a web application accepts an incoming request from a browser, processes it, and sends a response.
The first question that springs to mind is, how does the application know what to do with the incoming request? A shopping cart application will receive requests to display a catalog, add items to a cart, create an order, and so on. How does it route these requests to the appropriate code?
It turns out that Rails provides two ways to define how to route a request: a comprehensive way that you will use when you need to and a convenient way that you will generally use whenever you can.
The comprehensive way lets you define a direct mapping of URLs to actions based on pattern matching, requirements, ...
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