Appropriate response for excess KB submitted to REST API

Question

We have a REST API which is rate-limted according to number of requests, but also amount of KB submitted. If a client application exceeds their allowed quota of requests to an API endpoint we return a 429 Too Many Requests response, as per RFC6585 . But what is the appropriate response if a client exceeds the amount of KB allowed?

Answer 1

You can use:

400 Bad Request

or:

403 Forbidden

or:

406 Not Acceptable

or:

413 Request Entity Too Large