5xx Server error Obsolete.
HTTP 510 Not Extended
From the HTTP extension framework, an experiment that never caught on: the server needs further extensions to the request to fulfill it. The framework has since been moved to historic status, and the code is obsolete.
Defined in RFC 2774, section 7(opens in a new tab)
//_01 Uptime checks
Is 510 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 510 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/
Down. A 5xx means the server, or something in front of it, failed to answer.
//_02 Causes and fixes
Why you see 510 and what to do
Typical causes
- Very rare: software that implements the old extension framework.
If you run the site
- Don’t send it.
If you’re a visitor
- Nothing to do in a browser.
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 510 mean?
From the HTTP extension framework, an experiment that never caught on: the server needs further extensions to the request to fulfill it. The framework has since been moved to historic status, and the code is obsolete.
Does an uptime monitor count 510 as down?
Down. It is outside the default 200–399 range, so a monitor reports an outage once a second check confirms it. If 510 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Downtime is obsolete.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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