3xx Redirection Reserved, not used.
HTTP 306 (Unused)
Used in an earlier draft of the HTTP specification and no longer used. The code is reserved so it won’t be given a new meaning.
Defined in RFC 9110, section 15.4.7(opens in a new tab)
//_01 Uptime checks
Is 306 up or down for a monitor?
Uptimecheck HTTP monitor
Default settings
Up. By default an Uptimecheck HTTP monitor accepts 200–399 as up, so a 306 counts as up. With a keyword check, the page must also contain the word you set.
Is it down? checker
Free, at /is-it-down/
Up: the checker counts any answer below 500 as the site answering.
//_02 Causes and fixes
Why you see 306 and what to do
Typical causes
- None: servers don’t send it.
If you run the site
- Don’t send it.
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.
14-day free trial · No credit card required
Questions
What does HTTP 306 mean?
Used in an earlier draft of the HTTP specification and no longer used. The code is reserved so it won’t be given a new meaning.
Does an uptime monitor count 306 as down?
Up. By default an Uptimecheck HTTP monitor accepts 200–399 as up, so a 306 counts as up. With a keyword check, the page must also contain the word you set.
Downtime is obsolete.
Set up your first monitor in under a minute, or look around the live demo first.
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