"Too Many Requests" Response Code for the Constrained Application Protocol, January 2019
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A Constrained Application Protocol (CoAP) server can experience temporary overload because one or more clients are sending requests to the server at a higher rate than the server is capable or willing to handle. This document defines a new CoAP response code for a server to indicate that a client should reduce the rate of requests.
For the definition of Status, see RFC 2026.
For the definition of Stream, see RFC 8729.