HTTP 429

HTTP 429 “Too many requests” is an HTTP Return code that can be returned by a service if it doesn’t have enough resources to fulfill this request, or if a Rate Limit has been imposed on the consumer, which has been exceeded.

The response may contain a Retry-After header, which can either contain a timestamp or a delay in seconds when a new request can be attempted. Clients should honor the request to wait before resending the request.

If the Retry-After header is absent, then the client should apply Exponential Backoff when resending the request.