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5xx · Server Error

503Service Unavailable

The server is not ready to handle the request, often due to maintenance or overload.

What is HTTP 503?

The 503 Service Unavailable status means the server is temporarily unable to handle the request. This can be due to server overload or scheduled maintenance. The Retry-After header may indicate when to try again.

Example

Server under heavy load → 503 Service Unavailable

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Common Use Cases

  • Planned maintenance
  • Server overload
  • Deployment downtime
  • Auto-scaling lag

Quick Facts

Code503
Category5xx
TypeServer Error

Related 5xx Codes

500501502504