3xx Redirection
HTTP 301 Moved Permanently
The resource has a new permanent URL, given in the Location header. Browsers and search engines should use the new URL from now on, and browsers cache the redirect. For historical reasons, a client may change a POST into a GET when it follows a 301.
Defined in RFC 9110, section 15.4.2(opens in a new tab)
//_01 Uptime checks
Is 301 up or down for a monitor?
Uptimecheck HTTP monitor
Default settings
Up, as long as the page it leads to is. A monitor follows redirects by default, up to 10, and judges the final answer. With Follow redirects turned off, the 301 itself is judged, and it is within the default 200–399 range.
Is it down? checker
Free, at /is-it-down/
It follows up to 5 redirects and judges the final answer: anything below 500 counts as the site answering.
//_02 Causes and fixes
Why you see 301 and what to do
Typical causes
- HTTP to HTTPS, www to non-www (or back), a domain move, a changed page address or a trailing slash.
If you run the site
- Redirect straight to the final URL: chains of redirects slow every visit and dilute search signals.
- Use 308 instead for URLs that receive POST requests, such as API endpoints and forms.
- Update your own links to the new URL, and be sure before you use 301: browsers remember it.
If you’re a visitor
- Nothing to do. If the page keeps redirecting in a loop, clear the site’s cookies and cache.
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 301 mean?
The resource has a new permanent URL, given in the Location header. Browsers and search engines should use the new URL from now on, and browsers cache the redirect. For historical reasons, a client may change a POST into a GET when it follows a 301.
Does an uptime monitor count 301 as down?
Up, as long as the page it leads to is. A monitor follows redirects by default, up to 10, and judges the final answer. With Follow redirects turned off, the 301 itself is judged, and it is within the default 200–399 range.
Downtime is obsolete.
Set up your first monitor in under a minute, or look around the live demo first.
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