4xx Client error
HTTP 405 Method Not Allowed
The resource exists but doesn’t support the request method, for example a POST to a URL that only accepts GET. The server must send an Allow header listing the methods it does support.
Defined in RFC 9110, section 15.5.6(opens in a new tab)
//_01 Uptime checks
Is 405 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 405 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 405 comes from a server that is running.
//_02 Causes and fixes
Why you see 405 and what to do
Typical causes
- A form or API client using the wrong method or URL.
- A HEAD request to an application that only answers GET.
If you run the site
- Send an Allow header, and check the route accepts the methods your clients use.
- If you monitor an API endpoint, set the monitor’s method to one the endpoint accepts.
If you’re a visitor
- Go back and try again from the page with the form or button.
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 405 mean?
The resource exists but doesn’t support the request method, for example a POST to a URL that only accepts GET. The server must send an Allow header listing the methods it does support.
Does an uptime monitor count 405 as down?
Down. It is outside the default 200–399 range, so a monitor reports an outage once a second check confirms it. If 405 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Downtime is obsolete.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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