This is the 4th (and final) part of a 4 part series.
Part 1: Application + Database setup
Part 2: Validations + Transactions
Part 3: Testing
In this last part, we're going to make it so that our application can receive and respond to HTTP requests.
So far, we've been seeing how to use gems either from the dry-rb suite of gems, or the rom-rb suite of gems. In this part though, we're going to be using a gem from a different suite, a...