HTTP 429 — Too Many Requests
4xx Client Error
What it means
The client has been rate limited.
What to do about it
Back off and retry, honouring the Retry-After header. If you control the client, add exponential backoff with jitter — synchronised retries make the problem worse.
Where it sits
429 belongs to the 4xx family: The request contains something the server will not or cannot process. The fix is normally on the client side.
HTTP/1.1 429 Too Many RequestsChecking it yourself
# see the status code and headers only
curl -sI https://example.com/path
# follow redirects and print each hop
curl -sIL -o /dev/null -w "%{http_code} %{url_effective}\n" https://example.com/path
# JavaScript
const r = await fetch(url);
console.log(r.status, r.statusText);