Retry-After
How long to wait before retrying.
Response header (sent by servers) rate limit
How it works
Seconds or an HTTP date. Sent with 429, 503 and some redirects. Well-behaved clients never retry earlier.
Example
Retry-After: 30
See it live: send any request in Endpoint Client and open the Headers tab, where every response header is explained. Specification: RFC 9110.