When we think of routing, we often think of networking routers that send traffic on networks to their destinations. For the purposes of this book, when the term routing is used, the topic is how to map a target path to a handler function. There are many ways to do this, each with benefits and drawbacks. Sometimes, all you need is a static mapping of a target path string, such as /reminder to a function called CreateReminder. Then, any time a user visits your application with a target path of /reminder, your CreateReminder function will be triggered.
What happens, though, if you want to have a URL variable within the URL? For example, if we wanted to have /reminder/123 relate to a reminder resource with an ID of 123. It would be impractical to have all of the reminder IDs within the entire system mapped out by our target path router. You may consider performing...