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Eugene Chia13,723 Points
https://codex.wordpress.org/ apparently it's wrong !
This should be included into the answer.
Its wrong because the / at the end tells to look differently at how the link is entered. It then tries to read it as a raw database instead finding the index.html, home.html etc. So its basically trying to read what files are in the https://codex.wordpress.org directory.
The actual correct URL should be https://codex.wordpress.org
Correct me if im wrong.