Swift 3中的URLSession - URLAuthenticationChallenge

func urlSession(_ session: URLSession, didReceive challenge: URLAuthenticationChallenge, completionHandler: @escaping (URLSession.AuthChallengeDisposition, URLCredential?) -> Void) {
    if challenge.protectionSpace.authenticationMethod == NSURLAuthenticationMethodServerTrust {
        // 处理服务器证书验证
        let credential = URLCredential(trust: challenge.protectionSpace.serverTrust!)
        completionHandler(.useCredential, credential)
    } else if challenge.protectionSpace.authenticationMethod == NSURLAuthenticationMethodHTTPBasic {
        // 处理HTTP基本身份验证
        let credential = URLCredential(user: "username", password: "password", persistence: .forSession)
        completionHandler(.useCredential, credential)
    } else {
        // 其他身份验证方法
        completionHandler(.performDefaultHandling, nil)
    }
}