503 Service Unavailable - HTTP 编辑

The HyperText Transfer Protocol (HTTP) 503 Service Unavailable server error response code indicates that the server is not ready to handle the request.

Common causes are a server that is down for maintenance or that is overloaded. This response should be used for temporary conditions and the Retry-After HTTP header should, if possible, contain the estimated time for the recovery of the service.

Note: together with this response, a user-friendly page explaining the problem should be sent.

Caching-related headers that are sent along with this response should be taken care of, as a 503 status is often a temporary condition and responses shouldn't usually be cached.

Status

503 Service Unavailable

Specifications

Browser compatibility

BCD tables only load in the browser

The information shown below has been pulled from MDN's GitHub (https://github.com/mdn/browser-compat-data).

The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

See also

• Retry-After
• HTTP/1.1: Status Code Definitions