StackOverflow:

• Example of mod_dir conflict, exposing rewritten file-path. Use of env var to avoid repetition.
  URL masking not working for URLs that omit the trailing slash

ServerFault:

• Potential security vulnerability using "vulnerable" mod_rewrite directives in the server config. [Why CLOSED?] https://serverfault.com/questions/1091045/how-to-prevent-apache-rewriterule-from-accessing-root-path

Other/past usernames: w3d / w3dk / MrWhite