我有一个应用程序,可以在Xcode6-Beta1和Xcode6-Beta2与iOS7和iOS8上正常工作。但是对于Xcode6-Beta3, Beta4, Beta5,我在iOS8上面临网络问题,但在iOS7上一切都很好。我得到错误“网络连接丢失”。错误如下:

Error: ErrorDomain =NSURLErrorDomain Code=-1005 "The network connection was lost."UserInfo=0x7ba8e5b0 {NSErrorFailingURLStringKey=, _kCFStreamErrorCodeKey=57, NSErrorFailingURLKey=, NSLocalizedDescription=网络连接丢失。, _kCFStreamErrorDomainKey=1, NSUnderlyingError=0x7a6957e0 "The network connection was lost."}

我使用AFNetworking 2。X和下面的代码片段进行网络调用:

AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
[manager setSecurityPolicy:policy];
manager.requestSerializer = [AFHTTPRequestSerializer serializer];
manager.responseSerializer = [AFHTTPResponseSerializer serializer];

[manager POST:<example-url>
   parameters:<parameteres>
      success:^(AFHTTPRequestOperation *operation, id responseObject) {
          NSLog(@“Success: %@", responseObject);
      } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
          NSLog(@"Error: %@", error);
      }];

我尝试了NSURLSession,但仍然收到相同的错误。


当前回答

我的问题在服务器上。我正在使用Python的BaseHTTPRequestHandler类,我没有在响应中发送正文。当我像下面这样放一个空身体时,我的问题就解决了。

def do_POST(self):
    content_len = int(self.headers.get('Content-Length'))
    post_body = self.rfile.read(content_len)
    msg_string = post_body.decode("utf-8")
    msg_json = json.loads(msg_string)
    self.send_response(200)
    self.end_headers() #this and the following lines were missing
    self.wfile.write(b'') 

其他回答

如果有人在将文件上载到后端服务器时得到此错误,请确保接收服务器具有您的媒体允许的最大内容大小。在我的例子中,NGINX需要一个更高的client_max_body_size。NGINX会在上传完成之前拒绝请求,这样就不会返回错误代码。

参见pjebs 1月5日在Github上的评论。

Method1:

if (error.code == -1005)
{
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{

        dispatch_group_t downloadGroup = dispatch_group_create();
        dispatch_group_enter(downloadGroup);
        dispatch_group_wait(downloadGroup, dispatch_time(DISPATCH_TIME_NOW, 5000000000)); // Wait 5 seconds before trying again.
        dispatch_group_leave(downloadGroup);
        dispatch_async(dispatch_get_main_queue(), ^{
            //Main Queue stuff here
            [self redoRequest]; //Redo the function that made the Request.
        });
    });

    return;
}

也有人建议重新连接该网站,

即触发POST请求两次

解决方法:使用一个方法做连接到站点,返回(id),如果网络连接丢失,返回使用相同的方法。

方法2

-(id) connectionSitePost:(NSString *) postSender Url:(NSString *) URL {
     // here set NSMutableURLRequest =>  Request

    NSHTTPURLResponse *UrlResponse = nil;
    NSData *ResponseData = [[NSData alloc] init];

    ResponseData = [NSURLConnection sendSynchronousRequest:Request returningResponse:&UrlResponse error:&ErrorReturn];

     if ([UrlResponse statusCode] != 200) {

          if ([UrlResponse statusCode] == 0) {

                  /**** here re-use method ****/
                  return [self connectionSitePost: postSender Url: URL];
          }

     } else {
          return ResponseData;
     }

}

这个问题持续了几个月,最后发现当我们在api域中禁用DNSSEC时,一切都ok。

2017年1月25日,苹果发布了一份关于此错误的技术问答:

Apple Technical Q&A QA1941 Handling “The network connection was lost” Errors A: NSURLErrorNetworkConnectionLost is error -1005 in the NSURLErrorDomain error domain, and is displayed to users as “The network connection was lost”. This error means that the underlying TCP connection that’s carrying the HTTP request disconnected while the HTTP request was in progress (see below for more information about this). In some circumstances NSURLSession may retry such requests automatically (specifically, if the request is idempotent) but in other circumstances that’s not allowed by the HTTP standards. https://developer.apple.com/library/archive/qa/qa1941/_index.html#//apple_ref/doc/uid/DTS40017602

如果问题发生在设备上,检查流量是否通过代理(设置> Wi-Fi > (info) > HTTP代理)。我已经设置好了与Charles一起使用的设备,但忘记了代理。似乎没有Charles实际运行,就会出现这个错误。