Fix Trusted Host Settings error in Drupal status report

Summary

I installed Drupal 9 on OpenBSD few days ago. An error on "Trusted Host Settings" seemed to remain after installation via the web installer.
The cover image of this post is screenshot of the error.

Description

In order to fix it, all what to do is edit settings.php in web/sites.

$ doas nvim /var/www/.../<drupal-dir>/web/sites/default/settings.php
$ # settings.php is read-only by default

When <fqdn> is "sub.orroot.domain" in actual, add lines like this:

  /**
   * Trusted host configuration.
   *
   * Drupal core can use the Symfony trusted host mechanism to prevent HTTP Host
   * header spoofing.
   ...
   * For example:
   * @code
   * $settings['trusted_host_patterns'] = [
   *   '^www\.example\.com$',
   * ];
   * @endcode
   * will allow the site to only run from www.example.com.
   ...
   */
+ $settings['trusted_host_patterns'] = [   
+   '^sub\.orroot\.domain$',   
+ ];

Refreshing "Status report" page will bring comfortable result that all tests are passed.

Reference

• Drupal - Trusted Host settings