https://www.drupal.org/docs/installing-drupal/trusted-host-settings →
Problem: Documentation slightly outdated, and has only Drupal 8 as newest version mentioned, and might be good to mention self-hosting setups on local most of us use for new website development workflows.
Add how-to for Drupal 9 and Drupal 10, or just re-label Drupal 8 to included these options, as the information there might be enough to explain for newer versions. Also maybe some additional information about using HTTPS as the standard way a website is served to the Internet, whether or not user is asking for HTTPS in the address bar.
Active
Correction/Clarification
That page already contains a Protecting in Drupal 8 and later section, which is about Drupal 9 and Drupal 10.
The information about using https:// is not relevant for that page. The trusted host setting is an array containing patterns for the domain name; the protocol used to access the site is not included.