Setting up HTTPS or SSL certification

We will be using Let's Encrypt (https://letsencrypt.org/) a free, automated, and open certificate authority managed by the non-profit Internet Security Research Group (ISRG).

Secure Socket Layer (SSL) is a secure transport layer that can be used in any protocol; HTTPS is a common instance of it, that we will be implementing for our Superset web server.

Just like most other things, configuring SSL has OS level dependencies. First, we will install certbot, which is the free automated certificate service. It needs to verify our site first. It does this by doing some checks (which it calls challenges) in http://<url>/.well_known:

# Install certbot
sudo add-apt-repository ppa:certbot/certbot
sudo apt-get install certbot

# Create .well_known directory
cd /var/www/html
mkdir .well_known

We also need to update the superset.conf file in the...