My first 408...

[Renegade]

Everyone knows 404, and everyone has seen a few 403s, but a 408? Request timeout?

I've never actually seen that error until today. 

https://en.wikipedia.org/wiki/List_of_HTTP_status_codes

Check out the 451 error. Glad I've not seen any of those. Hope I never will.

[40hz]

Try accessing some of the US health insurance exchange websites. You'll see 408s regularly at certain times of the day.

[tomos]

https://en.wikipedia.org/wiki/List_of_HTTP_status_codes

from that:

418 I'm a teapot (RFC 2324)

Spoiler (click to show/hide)

This code was defined in 1998 as one of the traditional IETF April Fools' jokes, in RFC 2324, Hyper Text Coffee Pot Control Protocol, and is not expected to be implemented by actual HTTP servers.

[app103]

Let me know when you get your first 570 Authentication Failed (I used to get them all the time).

[rgdot]

417, story of my life

Spoiler (click to show/hide)

Expectation Failed

[Stoic Joker]

IETF. RFC 7169: The NSA (No Secrecy Afforded) Certificate Extension.

From: https://en.wikipedia.org/wiki/April_Fools%27_Day_RFC