5xx Server errors · Cloudflare (not part of the HTTP standard)
524 A Timeout Occurred
Cloudflare connected to the origin, but it didn't respond within 100 seconds.
Common causes
- A long-running request: big reports, slow queries, imports.
How to fix it
- Make the request faster, or run the work in the background and poll for the result.
Find out the moment your site returns 524
Spot Downtime monitors count this as down and alert you, since visitors see an error. (The public “Is it down?” checker treats 4xx answers from big sites as online, because many refuse automated requests.)