Before we get back to creating our express routes, we're going to take a quick moment to explore a feature of Postman that's going to make it a lot easier to switch between your local environment and the Heroku application. This is called Postman Environments.
Now, in order to illustrate this I am going to start up my local server by running node server/server.js command, and over inside of Postman we're going to start making a few requests. Now, if you remember, in the last section we made a request to our Heroku application. I click Send on the GET /todos URL and I get the todos array back as expected. The problem is that the actual items saved in the Collections tab, they all use that localhost URL and there's no good way to switch between the two. To fix this issue we're going to create environments, one for our local machine, and one for Heroku. This is going to let us create a variable as the URL and we can change that variable by flicking...