400 Bad request
The request is invalid.
The request lacks valid authentication credentials.
This user does not have the required permissions to access the resource.
404 Not found
The requested resource could not be found.
The request could not be processed because of a conflict in the current state of the resource.
413 Payload Too Large
The request is larger than the server is willing or able to process.
422 Unprocessable Entity
The request was well-formed but was unable to be followed due to semantic errors.
429 Too Many Requests
The client has sent too many requests in a given time period.