Alamofire网络REST调用抛出SSL错误(突然)

let manager = Session.default
manager.delegate.sessionDidReceiveChallenge = { session, challenge in
    if challenge.protectionSpace.authenticationMethod == NSURLAuthenticationMethodServerTrust {
        let trust = challenge.protectionSpace.serverTrust!
        let policy = ServerTrustPolicy.performDefaultEvaluation(validateHost: true)
        if policy.evaluate(trust, host: challenge.protectionSpace.host) {
            return (.useCredential, URLCredential(trust: trust))
        }
    }
    return (.cancelAuthenticationChallenge, nil)
}