X-RateLimit-Limit: 60
X-RateLimit-Remaining: 45
X-RateLimit-Reset: 1640000000

HTTP/1.1 429 Too Many Requests
Retry-After: 30

{
  "error": {
    "code": "rate_limit_exceeded",
    "message": "Rate limit exceeded. Retry in 30 seconds.",
    "retry_after": 30
  }
}

def api_request_with_retry(url)
  retries = 0
  begin
    response = HTTP.get(url)
    return response if response.status != 429

    retry_after = response.headers["Retry-After"].to_i
    sleep(retry_after)
    retries += 1
    retry if retries < 3
  rescue => e
    raise if retries >= 3
  end
end

response = HTTP.get(url)
remaining = response.headers["X-RateLimit-Remaining"].to_i

if remaining < 10
  Rails.logger.warn("API quota running low: #{remaining} remaining")
end