HTTP 418 I'm a Teapot vs 426 Upgrade Required
Both HTTP 418 (I'm a Teapot) and 426 (Upgrade Required) belong to the 4xx Client Error category. 418 indicates that any attempt to brew coffee with a teapot should result in this error. An April Fools' joke from 1998 that became a beloved part of HTTP culture. Meanwhile, 426 means that the server refuses to perform the request using the current protocol but might after the client upgrades to a different protocol.
Description
Any attempt to brew coffee with a teapot should result in this error. An April Fools' joke from 1998 that became a beloved part of HTTP culture.
When You See It
As an Easter egg on some websites, or when a server humorously refuses a request.
How to Fix
Use a coffee pot instead of a teapot. Or just enjoy the joke.
Description
The server refuses to perform the request using the current protocol but might after the client upgrades to a different protocol.
When You See It
When a server requires HTTPS or a newer protocol version.
How to Fix
Switch to the protocol specified in the Upgrade response header.
Key Differences
HTTP 418: Any attempt to brew coffee with a teapot should result in this error. An April Fools' joke from 1998 that became a beloved part of HTTP culture.
HTTP 426: The server refuses to perform the request using the current protocol but might after the client upgrades to a different protocol.
You encounter 418 when as an Easter egg on some websites, or when a server humorously refuses a request.
You encounter 426 when when a server requires HTTPS or a newer protocol version.
When to Use Which
For 418 (I'm a Teapot): Use a coffee pot instead of a teapot. Or just enjoy the joke. For 426 (Upgrade Required): Switch to the protocol specified in the Upgrade response header.