NSURLDomainError 1005“网络连接丢失”

Question

我在一个新升级到 Swift 2.0 的项目中依次执行以下两个调用。

let session = NSURLSession.sharedSession()
   authRequest.HTTPMethod = "POST"
   authRequest.HTTPBody = authData
   authRequest.addValue("application/json", forHTTPHeaderField: "Content-Type")
   authRequest.addValue("close", forHTTPHeaderField: "Connection")
   authRequest.addValue("application/json", forHTTPHeaderField: "Accept")
   let authTask = session.dataTaskWithRequest(authRequest, completionHandler: { (data : NSData?, response : NSURLResponse? , error : NSError?) -> Void in
       print("Response: \(response)")
       print("Error: \(error)")
       let strData = NSString(data: data!, encoding: NSUTF8StringEncoding)
       print("Body: \(strData)")
       if let httpResponse = response as? NSHTTPURLResponse
       {
           if 200 ... 299 ~= httpResponse.statusCode
           {
               do
               {
               result = try NSJSONSerialization.JSONObjectWithData(data!, options: .MutableLeaves) as! Dictionary
               credentials.ClientId = (result["client_id"] as String?)!
               credentials.ClientSecret = (result["client_secret"] as String?)!
               credentials.Username = userDetail.Username
               credentials.Password = userDetail.Password
                   completionHandler(result: true)
                                }
               catch {

               }
           }
           else
           {
               self.RemoveInvalidUserCredentials()
               completionHandler(result: false)
           }

       }

       })
       authTask.resume()

接着是：

let session = NSURLSession(configuration: NSURLSessionConfiguration.defaultSessionConfiguration())
   session.configuration.URLCache = nil
   session.configuration.HTTPMaximumConnectionsPerHost = 1
   tokenRequest.HTTPBody = tokenData
   tokenRequest.addValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
   tokenRequest.addValue("close", forHTTPHeaderField: "Connection")
   tokenRequest.addValue("Basic " + (credentials.encodedClientIdAndSecret() as String), forHTTPHeaderField: "Authorization")
   let tokenTask = session.dataTaskWithRequest(tokenRequest, completionHandler: {(data : NSData?, response : NSURLResponse? , error : NSError?) -> Void in
       print("Response: \(response)")
       print("Error: \(error)")
       let strData = NSString(data: data!, encoding: NSUTF8StringEncoding)
       print("Body: \(strData)")
       if let httpResponse = response as? NSHTTPURLResponse {
           if 200 ... 299 ~= httpResponse.statusCode
           {
               do
               {
               result = try NSJSONSerialization.JSONObjectWithData(data!, options: .MutableLeaves) as! Dictionary
               credentials.TokenType = (result["token_type"] as! String?)!
               credentials.Token = (result["access_token"] as! String?)!
               completionHandler(result: true)
               }
               catch{}
           }
       }
   })
   tokenTask.resume()

第一个代码块正确执行并返回以下内容：

Response: Optional(<NSHTTPURLResponse: 0x14ffe3e60> { URL: <URL>/authorize } { status code: 200, headers {
"Cache-Control" = "no-cache";
"Content-Length" = 115;
"Content-Type" = "application/json; charset=utf-8";
Date = "Tue, 29 Sep 2015 14:17:52 GMT";
Expires = "-1";
Pragma = "no-cache";
Server = "Microsoft-IIS/7.5";
"Set-Cookie" = ".AspNet.ApplicationCookie=E98BMJ5l56psnnJZRy2fyhRTWVYqw4aJsFqPeV1ktkJGi5_frTJ9-8pbp28TcDAn9ISFj_LqwFwOV7WhP1mfTVPktTGTs2Dr5-hvmnISxFVRc1Rg9CcYf3p-Cbn1w6qOEyuXco9PCmCnlsf54KPuSY6Z7FEcUgOyg2nq5oDyamfB_Y4b1dI-7cIZ3LB6ehoI50rIbc2ca7L7f73H1rhbsmuLRarBYsYehSRHRuKs9ec5-XuN0P1W6yqiQ3OOJMayPmmbi6y4uIhBUu0zoRC2v3k9usmRjubxGy2hqf6n0baTOIDokav0wQq_smR9qDA6nNh09YTS1Mzvf0iQPS2YJa7QrnERlNSixDROhkQVLC8hc3GV8jc9_7iGUhJzLgeVzhnjnVeB7Z311QLcXxGonEzzcWAzPu29tm2LkZgdte4J0kQHc-iTiNjSbgBqV2zVH9v_0JHtZCFGdSxSGptXGfsPr5O9M-EyVX2UNXxIsVI-hfv3p8-_igV96phbWsvWyqyYhVMQ8v61vHxfO2CFIQ; path=/; secure; HttpOnly";
"X-Powered-By" = "ASP.NET";

但是第二个有这个错误：

Error Domain=NSURLErrorDomain Code=-1005 "网络连接丢失。" UserInfo={NSUnderlyingError=0x14ffe3cc0 {错误域=kCFErrorDomainCFNetwork Code=-1005 "(null)" UserInfo={_kCFStreamErrorCodeKey=-4, _kCFStreamErrorDomainKey=4}}, NSErrorFailingURLStringKey=https://test.acumentive.com/tagmanager/api/v1/tokens, NSErrorFailingURLKey=https://test.acumentive.com/tagmanager/api/v1/tokens, _kCFStreamErrorDomainKey=4, _kCFStreamErrorCodeKey=-4, NSLocalizedDescription=网络连接丢失。}

我无权访问服务器，并尝试了不同的会话和相同的共享会话来发送请求。

有什么想法吗？

Answer 1

通过使用 NSURLConnection 而不是 NSURLSession 解决了这个问题。由于会话缓存了以前的连接，这似乎正在发生。

Answer 2

这就是错误 1005 的全部要点 - 您无权访问服务器。当您向服务器发送请求时，会发生以下两种情况之一：您可以访问服务器并返回状态代码，或者您的设备永远无法与服务器通信，因此服务器无法为您提供状态代码。相反，您会收到一个错误，通常在 #1000 左右。

这种情况非常罕见，这意味着您的设备开始与服务器通信，然后失去连接（当您下载数兆字节的文件时更常见）。想象一下有人从你的 Mac 中拔出一根网线，或者想象你带着 iPad 走出 WiFi 范围，正在向服务器发出请求。

我建议您将手机更改为“飞行”模式，看看会发生什么 - 每个请求都会收到类似的错误，您应该测试您的应用是否能够正常运行。当您关闭“飞行”模式时，它也应该恢复到全部功能。