Technical requirements

All commands described in this book are run on a MacBook Pro using macOS Mojave but modifying this so that it can run on other platforms, such as Linux or Windows, should be straightforward.

The only new tool required for this chapter is the command-line ngrok tool used for establishing an HTTP tunnel from the internet to our local environment. It can be installed using Homebrew with the following command:

brew cask install ngrok

To use ngrok, a free account has to be created and an authorization token also has to be registered by taking the following steps:

1. Sign up here: https://dashboard.ngrok.com/signup.
2. After the account is created, run the following command:

ngrok authtoken <YOUR_AUTH_TOKEN>

Here, <YOUR_AUTH_TOKEN> is replaced with the authorization token found on the following page—https://dashboard...