RateLimitExceededEvent
Emitted when an HTTP 429 (Too Many Requests) response is received from the authorization server.
The KMP client does not implement retry logic internally — it emits this event and propagates the error to the caller. Retry behavior is the caller's responsibility; use retryAfterSeconds to honour the server's requested backoff.
Parameters
requestUrl
the URL of the request that was rate-limited.
responseHeaders
all response headers from the rate-limited response.
retryAfterSeconds
the parsed Retry-After header value in seconds, or null if absent.