APNS确定提供者令牌年龄的方式是通过发送一个HTTP/2请求来检索令牌，如果令牌已过期，则请求将返回类似于410状态码的响应。

以下是一个示例，展示了如何发送一个HTTP/2请求，并处理类似于410状态码的响应：

let url = URL(string: "https://api.push.apple.com/3/device/DEVICE-TOKEN")!
var request = URLRequest(url: url)
request.httpMethod = "GET"
request.setValue("Bearer AUTHORIZATION_TOKEN", forHTTPHeaderField: "authorization")

let session = URLSession(configuration: .default)
let task = session.dataTask(with: request) { (data, response, error) in
    if let response = response as? HTTPURLResponse {
        if response.statusCode == 410 {
            // Token is expired
        } else {
            // Token is still valid
        }
    }
}
task.resume()