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## Status Codes

When you call any of the REST operations, the response returns one of the standard HTTP status codes defined in the following table.:

HTTP Status Code | Description
--- | ---
`200 OK` | The request was completed successfully A 200 status is returned for a successful `GET` or `POST` method.
`400 Bad Request` | The request could not be processed because it contains missing or invalid information (such as a validation error on a parameter or a missing required value).
`401 Unauthorized` | The request is not authorized. The authentication credentials included with this request are missing or invalid.
`403 Forbidden` | The user can't be authenticated. The user does not have authorization to perform this request.
`404 Not Found` | The request includes a resource URI that does not exist.
`405 Method Not Allowed` | The HTTP verb specified in the request (`DELETE`, `GET`, `POST`, `PUT`) is not supported for this request URI.
`415 Unsupported Media Type` | The client's Content-Type header is not correct (for example, the client attempts to send the request in XML, but the resource can only accept JSON).
`500 Internal Server Error` | The server encountered an unexpected condition that prevented it from fulfilling the request.
`503 Service Unavailable` | The server is unable to handle the request due to temporary overloading or maintenance of the server. The DCS Agent REST service is not currently running.