About Standard HTTP Status Codes and Error Messages

Siebel CRM REST API uses standard HTTP status codes, as described in the following table, to indicate the success or failure of API calls. When an error occurs or when a response is successful, the response header contains a HTTP code and the response body usually contains a message accompanying the HTTP response code with additional information about the error.

HTTP Code	Message	Description
200	OK	The request successfully executed and the response has content.
204	No Content	The request successfully executed, but the content is unavailable. For example, the content was deleted.
401	Unauthorized	The request had invalid authorization credentials.
404	Not Found	The requested resource was not found because of an invalid object name.
405	Not Allowed	The request is not allowed.
406	Not Acceptable	The resource identified by the request is capable of generating only response entities that have content characteristics that are not acceptable according to the accept headers sent in the request.
415	Unsupported Media Type	The data format of the request body, specified in the Content-Type header, is unsupported by the targeted resource.
500	Internal Server Error	The server encountered an unexpected error, preventing it from fulfilling the request.