错误代码：错误域=NSCocoaErrorDomain 代码=3840 "JSON text did not start with array or object and option to allow fragments not set."

Question

我在使用 afNetworking PUT 方法时遇到了这个错误。请帮忙。

Error Domain=NSCocoaErrorDomain Code=3840 "JSON text did not start with array or object and option to allow fragments not set." UserInfo={NSDebugDescription=JSON text did not start with array or object and option to allow fragments not set.}

这是我的代码：-

 NSInteger intUserID = [[prefs stringForKey:@"user_id"] integerValue];
                NSInteger intProdID = [_strProdID integerValue];

                AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
                AFJSONRequestSerializer *serializer = [AFJSONRequestSerializer serializer];
                [serializer setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
                [serializer setValue:@"application/json" forHTTPHeaderField:@"Accept"];
                manager.requestSerializer = serializer;

                NSDictionary *params = @{@"In d":@(1),@"user_id":@(intUserID),@"product_id":@(intProdID)};

                [manager PUT:@"http://api.XXX.com/api/product/wishlist_add" parameters:params success:^(NSURLSessionTask *task, id responseObject) {


                }failure:^(NSURLSessionTask *operation, NSError *error) {
                    NSLog(@"Error Code : %@", error);
                }];

Answer 1

It clearly says you have sent wrong JSON format. Means there is two possibility.

要么你发错了json.
或者您的服务器无法解析您请求的数据。

我已经遇到过同样的问题。请使用下面的代码，我相信它对你有用。

NSInteger intUserID = [[prefs stringForKey:@"user_id"] integerValue];
NSInteger intProdID = [_strProdID integerValue];
NSDictionary *params = @{@"In d":@(1),@"user_id":@(intUserID),@"product_id":@(intProdID)};

NSError *error;
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:params
    options:NSJSONWritingPrettyPrinted // Pass 0 if you don't care about the readability of the generated string
    error:&error];

if (! jsonData) {
    NSLog(@"Got an error: %@", error);
} else {
    NSString *jsonString = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];

    AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
    AFJSONRequestSerializer *serializer = [AFJSONRequestSerializer serializer];
    [serializer setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
    [serializer setValue:@"application/json" forHTTPHeaderField:@"Accept"];
    manager.requestSerializer = serializer;

    [manager PUT:@"http://api.XXX.com/api/product/wishlist_add" parameters:jsonString success:^(NSURLSessionTask *task, id responseObject) {
        }failure:^(NSURLSessionTask *operation, NSError *error) {
        NSLog(@"Error Code : %@", error);
        }];
}

从 here

中查找参考

更新：

它工作正常。请参阅下面的截图。

请确保 user_id 和 product_id 值不应为 nil

Answer 2

出现这个错误主要有两个原因。

服务器无法解析您请求的数据
发送错误请求

首先尝试在邮递员上调用网络服务。如果您的网络服务调用成功并且您获得响应数据，则使用 json 验证器验证该 json 响应。如果 json 响应有效，则检查您的请求。

大多数时候问题出在我们发送给服务器的请求上。

编码愉快。

错误代码：错误域=NSCocoaErrorDomain 代码=3840 "JSON text did not start with array or object and option to allow fragments not set."

Error Code : Error Domain=NSCocoaErrorDomain Code=3840 "JSON text did not start with array or object and option to allow fragments not set."

api

json

put

ios

afnetworking