4xx Client error Reserved, not used.
HTTP 418 (Unused)
Known as “I’m a teapot” from RFC 2324, an April Fools’ joke from 1998 about controlling coffee pots over HTTP. Because many applications use it as a joke, RFC 9110 reserves 418 so it is never given a real meaning. Some sites answer bots with it.
//_01 Uptime checks
Is 418 up or down for a monitor?
Uptimecheck HTTP monitor
Default settings
Down. It is outside the default 200–399 range, so a monitor reports an outage once a second check confirms it. If 418 is the answer you expect from that URL, add it to the monitor’s expected status codes.
Is it down? checker
Free, at /is-it-down/
Up. The checker counts any answer below 500 as the site answering: a 418 comes from a server that is running.
//_02 Causes and fixes
Why you see 418 and what to do
Typical causes
- An Easter egg, or a site refusing a request it thinks comes from a bot.
If you run the site
- Don’t use it for real errors; pick a code clients understand, such as 403 or 429.
If you’re a visitor
- Nothing to do.
Know the moment your site stops answering as it should
An Uptimecheck monitor requests your page as often as every minute, checks the status code against the ones you expect, confirms a failure with a second check and then alerts you.
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Questions
What does HTTP 418 mean?
Known as “I’m a teapot” from RFC 2324, an April Fools’ joke from 1998 about controlling coffee pots over HTTP. Because many applications use it as a joke, RFC 9110 reserves 418 so it is never given a real meaning. Some sites answer bots with it.
Does an uptime monitor count 418 as down?
Down. It is outside the default 200–399 range, so a monitor reports an outage once a second check confirms it. If 418 is the answer you expect from that URL, add it to the monitor’s expected status codes.
Downtime is obsolete.
Set up your first monitor in under a minute, or look around the live demo first.
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