4.1 Response status code

ID	Description
102	Processing - an interim Response used to inform the Producer that the Consumer has accepted the Command but has not yet completed it.
200	OK - the Command has succeeded.
400	Bad Request - the Consumer cannot process the Command due to something that is perceived to be a Producer error (e.g., malformed Command syntax).
401	Unauthorized - the Command Message lacks valid authentication credentials for the target resource or authorization has been refused for the submitted credentials.
403	Forbidden - the Consumer understood the Command but refuses to authorize it.
404	Not Found - the Consumer has not found anything matching the Command.
500	Internal Error - the Consumer encountered an unexpected condition that prevented it from performing the Command.
501	Not Implemented - the Consumer does not support the functionality required to perform the Command.
503	Service Unavailable - the Consumer is currently unable to perform the Command due to a temporary overloading or maintenance of the Consumer.