Swift URLSession 防止重定向

Question

我有一个用于对服务器进行身份验证的客户端代码(已实现服务器，以便在成功时我收到重定向网址)，并且想要检查状态代码是否为 302。但是请求会自动重定向，响应结果是200。那么问题是如何防止自动重定向？

let params = ["username":LoginField.text, "password":PassField.text] as! Dictionary<String, String>

    var request = URLRequest(url: URL(string: NSLocalizedString("url_login", comment: ""))!)
    request.httpMethod = "POST"
    request.httpBody = try? JSONSerialization.data(withJSONObject: params, options: [])
    request.addValue("application/json", forHTTPHeaderField: "Content-Type")

    let session = URLSession.shared
    let task = session.dataTask(with: request, completionHandler: { data, response, error -> Void in
            if let httpResponse = response as? HTTPURLResponse {
                if httpResponse.statusCode == 302 {

                    result=1;

                }else{
                    result=0;
                }
            }
            semaphore.signal() 
    })

Answer 1

将委托(delegate)分配给 Controller 或类中的 URLSession，并实现以下功能。来源here并确保 ULRSession 不是后台 session 。

extension YourControllerOrClass: NSURLSessionTaskDelegate {
    func URLSession(session: NSURLSession,
    task: NSURLSessionTask,
    willPerformHTTPRedirection response: NSHTTPURLResponse,
    newRequest request: NSURLRequest,
    completionHandler: (NSURLRequest!) -> Void) {
    // Stops the redirection, and returns (internally) the response body.
    completionHandler(nil)
  }
}