HTTP Response Codes

Code	Title	Description
200	OK	Successful operation.
201	Created	Resource created.
400	Bad Request	Invalid parameter.
401	Unauthorized	Invalid token.
403	Forbidden	No permissions.
404	Not Found	Resource not found.
405	Method Not Allowed	HTTP verb not allowed.
409	Conflict	Conflict in the request.
411	Length Required	Missing Content-Length header.
412	Precondition Failed	Precondition failed.
429	Too Many Requests	Request limit exceeded.
500	Internal Server Error	Server error.
503	Service Unavailable	Service unavailable.