503 Service Unavailable
503 Service Unavailable is a status that a server can send when they
are overloaded, or otherwise incapable of handling a request. It couls still
be starting, or it perhaps the application is partially down.
When this status is returned, a server can optionally include a Retry-After
header to tell a client when to try the request again.
Example
HTTP/1.1 503 Service Unavailable
Content-Type text/plain
Retry-After: 1800
System overload! Give us some time to increase capacity.
References
- RFC7231, Section 6.6.4 - 503 Service Unavailable
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