StackOverflow:

• Example of mod_dir conflict, exposing rewritten file-path. Use of env var to avoid repetition.
  https://stackoverflow.com/questions/70990152/url-masking-not-working-for-external-links

ServerFault:

• Potential security vulnerability using "vulnerable" mod_rewrite directives in the server config. [Why CLOSED?] How to prevent Apache RewriteRule from accessing root path

Other/past usernames: w3d / w3dk / MrWhite