swift中，如何支持https呢？
https分为单向（客户端校验服务端）的和双向（客户端/服务端相互校验）具体可查阅相关资料。
实现URLSessionDelegate协议中
urlSession(_ session: didReceive challenge: completionHandler: )
具体实现如下：
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| func urlSession(_ session: URLSession, didReceive challenge: URLAuthenticationChallenge, completionHandler: @escaping (URLSession.AuthChallengeDisposition, URLCredential?) -> Void) {
var disposition = URLSession.AuthChallengeDisposition.performDefaultHandling
var credential:URLCredential? = nil
/*disposition：如何处理证书
performDefaultHandling:默认方式处理
useCredential：使用指定的证书
cancelAuthenticationChallenge：取消请求
*/
if challenge.protectionSpace.authenticationMethod == NSURLAuthenticationMethodServerTrust {
credential = URLCredential(trust: challenge.protectionSpace.serverTrust!)
if credential != nil {
disposition = URLSession.AuthChallengeDisposition.useCredential
}
}else if challenge.protectionSpace.authenticationMethod == NSURLAuthenticationMethodClientCertificate {
//单向验证，客户端不需要服务端验证，此处与默认处理一致即可
disposition = URLSession.AuthChallengeDisposition.cancelAuthenticationChallenge
}
else {
disposition = URLSession.AuthChallengeDisposition.cancelAuthenticationChallenge
}
completionHandler(disposition, credential)
}
}
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