HTTP status codes
When working with a Common REST API over HTTP, client applications should expect at least the following HTTP status codes. Not all servers necessarily return all status codes identified here:
- 200 OK
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The request was successful and a resource returned, depending on the request.
- 201 Created
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The request succeeded and the resource was created.
- 204 No Content
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The action request succeeded, and there was no content to return.
- 304 Not Modified
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The read request included an
If-None-Matchheader, and the value of the header matched the revision value of the resource. - 400 Bad Request
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The request was malformed.
- 401 Unauthorized
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The request requires user authentication.
- 403 Forbidden
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Access was forbidden during an operation on a resource.
- 404 Not Found
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The specified resource could not be found, perhaps because it does not exist.
- 405 Method Not Allowed
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The HTTP method is not allowed for the requested resource.
- 406 Not Acceptable
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The request contains parameters that are not acceptable, such as a resource or protocol version that is not available.
- 409 Conflict
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The request would have resulted in a conflict with the current state of the resource.
- 410 Gone
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The requested resource is no longer available, and will not become available again. This can happen when resources expire for example.
- 412 Precondition Failed
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The resource’s current version does not match the version provided.
- 415 Unsupported Media Type
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The request is in a format not supported by the requested resource for the requested method.
- 428 Precondition Required
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The resource requires a version, but no version was supplied in the request.
- 500 Internal Server Error
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The server encountered an unexpected condition that prevented it from fulfilling the request.
- 501 Not Implemented
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The resource does not support the functionality required to fulfill the request.
- 503 Service Unavailable
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The requested resource was temporarily unavailable. The service may have been disabled, for example.