4xx Client error
HTTP 409 Conflict
The request conflicts with the current state of the resource, for example an edit to a version that someone else changed in the meantime, or creating something that already exists. The response should explain the conflict so it can be resolved.
//_01 Uptime checks
Is 409 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 409 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 409 comes from a server that is running.
//_02 Causes and fixes
Why you see 409 and what to do
Typical causes
- Two people or processes editing the same thing.
- Creating a record with a name or ID that is taken.
If you run the site
- Explain the conflict in the response, and use ETags with If-Match to detect lost updates.
If you’re a visitor
- Reload to get the latest version, then make your change again.
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 409 mean?
The request conflicts with the current state of the resource, for example an edit to a version that someone else changed in the meantime, or creating something that already exists. The response should explain the conflict so it can be resolved.
Does an uptime monitor count 409 as down?
Down. It is outside the default 200–399 range, so a monitor reports an outage once a second check confirms it. If 409 is the answer you expect from that URL, add it to the monitor’s expected status codes.
Downtime is obsolete.
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