Code	HTTP definition	Description
200	Success	Everything worked as expected.
201	Created	The item was created.
204	No Content	Returned for PUT, POST, or DELETE requests when you should not expect a response body to be returned.
304	Nor Modified	Returned for conditional GET requests when nothing has changed since the previous request.
400	Bad Request	The request was not understood by the server, often due to incorrect syntax or parameters. More information can often be found in the error details section of the response body.
401	Unauthorized	Your request did not have valid authentication credentials. This usually means that the Authorization header was not formatted correctly.
403	Forbidden	Your request had valid authentication credentials, but those credentials are not allowed to complete the requested operation. This usually means that the system account you are using needs to be authorized in COS for the resource or operation.
404	Not Found	The resource you requested does not exist.
409	Conflict	Your request failed due to a conflict with the current state of the resource. See the documentation for the specific API and the response body for more information.
412	Precondition Failed	Your request contained preconditions that were not met. See the documentation for the specific API and the response body for more information.
422	Unprocessable Entity	The content type and syntax of the request are correct, but the server was unable to process the instructions. See the documentation for the specific API and the response body for more information.
429	Too Many Requests	Your requests are coming too often, or the server is under a heavy load. Try the request again later. If the API continues to return this error, consider implementing exponential backoff.
500	Internal Server Error	An error occurred on our end. Try the request again later.