Routing requests

Now, let's take a look at the routing block:

routing { 
    get("/") { 
        call.respondText("OK") 
    } 
}

This block describes all the URLs that will be handled by our server. In this case, we only handle the root URL. When that URL is requested, a text response, OK, will be returned to the user.

The following code returns a text response. Now, let's see how we can return a JSON response instead:

get("/status") {
    call.respond(mapOf("status" to "OK"))
}

Instead of using the respondText() method, we'll use respond(), which receives an object instead of a string. In our example, we're passing a map of strings to the respond() function. If we run this code, though, we'll get an exception.

This is because, by default, objects are not serialized into JSON. Multiple libraries...