Query REST Service error response

When an error occurs, the service returns an error response containing the relevant HTTP status code. The table [below] lists the possible HTTP status codes. Each status code relates to a certain error type:

Status code	Description
400 Bad Request	Could not parse request.
401 Unauthorized	No authentication credentials provided or authentication failed.
403 Forbidden	Authenticated user does not have access.
404 Not Found	Resource not found.
500, 501, 502, 503, etc	An internal server error occurred.

If available, the response body also contains an error message.

E.g., the system returns the following response if the mandatory q URL parameter is empty:

HTTP/1.1 400 Bad Request
{
 "messages": {
 "errors": [
  "Parameter 'q' is mandatory."
 ]
 },
 "response": null
}