HTTP 218 – This Is Fine
A non-standard, informal code some Apache/PHP-FPM setups return to indicate an error occurred but was handled gracefully - a reference to the "this is fine" meme.
Common use case
Occasionally surfaces in misconfigured or legacy Apache mod_php setups when a PHP notice or warning is emitted but the script otherwise completes.
History
Not part of any official HTTP specification - it emerged informally from real-world server misconfigurations rather than a standards body.
Did you know?
The name is a direct nod to the "this is fine" dog-in-a-burning-room webcomic (KC Green, 2013) - a joke about pretending everything is okay while it clearly isn't.