Handling the form POST

There are typically three things we need to do when handling form input: validate the input, show an error message if the input is invalid, and show a success message when the input is valid and accepted.

In order for us to validate the form input, we need to create a route where the form will POST. We made a number of these in the previous chapter, so we'll draw on that experience and pattern.

Let's create a new route for the same URL, /signup, but this time we'll ensure that it accepts a POST request instead of a GET request. We'll put it along with the existing /signup GET route in our hipstr.routes.home namespace:

(defroutes home-routes
  (GET   "/"        []       (home-page))
  (GET   "/about"   []       (about-page))
  (GET   "/signup"  []       (signup-page))
  (POST  "/signup"  [& form] (str "nice job"))

We now have two routes for the same URL, one that will handle the GET request, and...