AFNetWorking Request failed: unacceptable content-type: text/html

今天写了一个快递查询的功能，使用的是AFNetWorking框架，

贴个代码：

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{
        NSDictionary *dict=@{@"key": @"key",@"com": @"shentong",@"cno": @"768938779991"};
        NSString* encodedString = [@"http://api.kuaidiwo.cn:88/api/" stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
        [appdelegate.manager POST:encodedString parameters:dict success:^(AFHTTPRequestOperation *operation, id responseObject) {
            NSLog(@"%@",responseObject);
        } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
            NSLog(@"%@",error);
        }];
    });

红色的是请求链接，好了，按说是没问题（但是如果别人写后台不规范，明明传回来的是json，但是写后台那个鸟非要写：

 response.setContentType("text/html");
  response.getWriter().write(json)） 把返回的内容类型写成"text/html",因为 AFNetWorking框架是解析不了这种类型的，所以就会报错，这时候抱怨那老鸟是没用的，难道你想拿板砖拍他么～还是好好改你的代码吧！
如果规范写，应该这样写：

For JSON:

Content-Type: application/json

 response.setContentType(application/json");

For JSON-P:

Content-Type: application/javascript

请参考：
http://stackoverflow.com/questions/477816/what-is-the-correct-json-content-type

所以，我们必须要设置我们的解析器：
self.manager.responseSerializer.acceptableContentTypes = [NSSet setWithObject:@"text/html"];

加上这句话，

这时候运行，如果你的请求方式是post，那我就呵呵了，我也是这样，后来报错，苦逼～

错误代码：

2014-10-14 22:43:32.953 测试快递[5208:60b] Error Domain=NSCocoaErrorDomain Code=3840 "The operation couldn’t be completed. (Cocoa error 3840.)" (JSON text did not start with array or object and option to allow fragments not set.) UserInfo=0x8c9a410 {NSDebugDescription=JSON text did not start with array or object and option to allow fragments not set.}

原谅我英语那么差，我也不知道问题错哪了，调了一下午，无意间把post改称get，那么问题来了，到底对不对呢？恭喜自己，真的对了～

014-10-14 22:45:10.135 测试快递[5229:60b] {
    "ems_info" =     {
        adate = "2014-06-30 18:13";
        des =         (
        );
        kind = "U7533U901a";
        num = 768938779991;
        sign = "U8349U7b7e";
        state = 3;
    };
    errcode = 0;
    "track_data" =     {
        data =         (
                        {
                datetime = "2014-06-28 01:26:39";
                info = "U5e7fU4e1cU4e1cU839eU864eU95e8U5317U6805U5206U90e8 U7684U6536U4ef6U5458 U7f57U8fd0U91d1U5df2U6536U4ef6";
                place =                 (
                );
            },
                        {
                datetime = "2014-06-28 01:30:39";
                info = "U7531 U5e7fU4e1cU4e1cU839eU864eU95e8U5317U6805U5206U90e8 U53d1U5f80 U5e7fU4e1cU4e1cU839eU4e2dU8f6cU90e8";
                place = "U5e7fU4e1cU4e1cU839e";
            },
                        {
                datetime = "2014-06-28 04:21:17";
                info = "U5e7fU4e1cU4e1cU839eU4e2dU8f6cU90e8 U6b63U5728U8fdbU884c U88c5U888b U626bU63cf";
                place =                 (
                );
            },
                        {
                datetime = "2014-06-28 04:21:17";
                info = "U7531U5e7fU4e1cU4e1cU839eU4e2dU8f6cU90e8 U53d1U5f80 U56dbU5dddU5357U5145U822aU7a7aU90e8";
                place = "U56dbU5dddU5357U5145U822aU7a7aU90e8";
            },
                        {
                datetime = "2014-06-29 01:23:43";
                info = "U7531U56dbU5dddU6210U90fdU822aU7a7aU90e8 U53d1U5f80 U56dbU5dddU5357U5145U4e2dU8f6cU90e8";
                place = "U56dbU5dddU5357U5145";
            },
                        {
                datetime = "2014-06-29 06:26:36";
                info = "U7531U56dbU5dddU5357U5145U4e2dU8f6cU90e8 U53d1U5f80 U56dbU5dddU5ba3U6c49U516cU53f8";
                place = "U56dbU5dddU5ba3U6c49";
            },
                        {
                datetime = "2014-06-30 06:53:12";
                info = "U5febU4ef6U5df2U5230U8fbe U56dbU5dddU5ba3U6c49U516cU53f8";
                place = "U56dbU5dddU5ba3U6c49";
            },
                        {
                datetime = "2014-06-30 13:14:51";
                info = "U56dbU5dddU5ba3U6c49U516cU53f8 U7684U6d3eU4ef6U5458 U7b26U5148U751f U6b63U5728U6d3eU4ef6";
                place = "U56dbU5dddU5ba3U6c49U516cU53f8";
            },
                        {
                datetime = "2014-06-30 18:13:48";
                info = "U5df2U7b7eU6536,U7b7eU6536U4ebaU662fU8349U7b7e";
                place =                 (
                );
            }
        );
    };
}

如果有大神知道那段英文啥意思，麻烦留言下。