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NSURL *url = [NSURLURLWithString:@"http://192.108.1.109:8080/qqqqq/user/login"];

    NSMutableURLRequest *request = [NSMutableURLRequestrequestWithURL:url];

    request.HTTPMethod = @"POST";

    NSDictionary *dict = @{

                           @"userID":@"111",

                           @"captcha":@"111"

                           };

    NSData *json = [NSJSONSerializationdataWithJSONObject:dictoptions:0error:nil];

    NSString *rdata=[[NSStringalloc]initWithData:jsonencoding:NSUTF8StringEncoding];

    rdata=[NSString stringWithFormat:@"req=%@",rdata];

    NSLog(@"%@",rdata);

    request.HTTPBody = [rdatadataUsingEncoding:NSUTF8StringEncoding];

    

    [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueuemainQueue]completionHandler:^(NSURLResponse *_Nullable response,NSData * _Nullable data,NSError * _Nullable connectionError) {

        if (data == nil || connectionError) return;

        NSDictionary *dict = [NSJSONSerializationJSONObjectWithData:dataoptions:NSJSONReadingMutableLeaveserror:nil];

        NSString *result = [[NSStringalloc]initWithData:data encoding:NSUTF8StringEncoding];

        NSLog(@"%@", result);

        NSLog(@"dict=%@", dict);

       

        NSString *error = dict[@"error"];

        if (error) {

            [MBProgressHUD showError:error];

        } else {

            NSString *success = dict[@"success"];

            [MBProgressHUD showSuccess:success];

        }

        

    }];