ios - NSURLSession 获得 200 成功，错误域 = NSURLErrorDomain 代码 = -1005 “网络连接丢失。” 在 iOS11

Question

我正在使用 xcode 9.2 和 iOS 11.4 开发应用程序。当我尝试 NSURLSession downloadTaskWithRequest 在后台和前台切换应用程序状态时，有时应用程序会获得 200 次成功，错误域=NSURLErrorDomain Code=-1005 “网络连接丢失。”</p>

错误如下：

NSLocalizedDescription = "网络连接丢失。"; NSUnderlyingError = "错误域=kCFErrorDomainCFNetwork Code=-1005 \"(null)\" UserInfo={NSErrorPeerAddressKey={length = 28, capacity = 28, bytes = 0x1c1e01bb000000002604558000210000 ... a5c562bc00000000}, _kCFErrorStreamErrorCodeKey=57," ; "_kCFStreamErrorCodeKey" = 57; "_kCFStreamErrorDomainKey" = 1;

我的要求如下：

NSMutableURLRequest *urlRequest = nil;
    NSString *urlString = nil;
    NSURL * url = nil;

    urlString = [NSString stringWithFormat:@"https://%@%@", self.requestUrl, self.queueName];
    url = [NSURL URLWithString:urlString];
    urlRequest = [NSMutableURLRequest requestWithURL:url];
    urlRequest.cachePolicy = NSURLRequestReloadIgnoringLocalCacheData;

    [urlRequest addValue:@"" forHTTPHeaderField:@"User-Agent";

[urlRequest setHTTPMethod:@"DELETE"];
            [urlRequest setTimeoutInterval:REQUEST_TIMEOUT];
            [urlRequest addValue:@"correlID, msgId, usr-clientMessageId" forHTTPHeaderField:@"x-msg-require-headers"];
            [urlRequest addValue:self.messageInfo.messageId  forHTTPHeaderField:@"x-msg-msgId"];
            [urlRequest addValue:@"Delivery"  forHTTPHeaderField:@"applicationOrgin"];
             [urlRequest addValue:@"" forHTTPHeaderField: @"x-msg-wait";

downloadTaskWithRequest 代码片段如下：

self.downloadTask = [self.urlSession downloadTaskWithRequest:urlRequest completionHandler:
                             ^(NSURL *location, NSURLResponse *response, NSError *error){
                                 FLog(@"received response for message type: %d and operation type: %d\n",self.messageType, self.requestType);
                                 NSHTTPURLResponse* httpResponse = (NSHTTPURLResponse*)response;
                                 FLog(@"%ld for operation %d for request type %d",(long)[httpResponse statusCode],self.self.messageType,self.requestType);
                                 FLog(@"response is  %@",response);
                                 NSHTTPURLResponse *httpresp = (NSHTTPURLResponse *)response;
                                 NSString * origId = [[httpresp allHeaderFields] objectForKey:(@"x-msg-msgId")];
                                 FLog(@"recieved response header %@",httpresp.allHeaderFields);
                                 [self downloadCompletedWithResponse:response location:location error:error];
                             }];
        [self.downloadTask resume];

有人面临同样的问题吗？任何有想法的人都可以解决这个问题吗

标签： iosobjective-cxcodeios11nsurlsession