4xx Client errors
418 I'm a teapot
An April Fools' joke code: the server refuses to brew coffee because it's a teapot.
Common causes
- Easter eggs, or some services using it to turn away bots.
How to fix it
- Nothing to fix, unless a service uses it to block you.
Find out the moment your site returns 418
Spot Downtime monitors count this as down and alert you, since visitors see an error. (The public “Is it down?” checker treats 4xx answers from big sites as online, because many refuse automated requests.)