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If we get a 429 response during node registration, use the `Retry-After` header for backoff instead of the regular exponential backoff. The rate limiter error is propagated to the user, just like other registration errors are, e.g. ``` $ tailscale up backend error: node registration rate limited; will retry after 57s exit status 1 ``` Updates tailscale/corp#39533 Signed-off-by: Anton Tolchanov <anton@tailscale.com>