503
HTTP 503 Service Unavailable
5xx Server Error
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5xx Server Error
RFC 7231, Section 6.6.4
What is HTTP 503 Service Unavailable?
The 503 (Service Unavailable) status code indicates that the server is currently unable to handle the request due to a temporary overload or scheduled maintenance which will likely be alleviated after some delay. The response should include a Retry-After header indicating when the service is expected to be available again.
Common Use Cases
- Server maintenance mode
- Traffic overload or spikes
- Application deployment in progress
- Resource exhaustion (connections, threads)