POST request with JSON body AFNetworking 2.0

NSString *urlString =[NSString stringWithFormat:@"http://192.168.0.202/Mall/Mallorder/index/user_id/1/token/123abc?user_id=16&token=b193156baf78d7ae22a11630be10d30c"];
NSString *jsonString = @"[{\"goodsId\":1,\"itemId\":1,\"num\":1},{\"goodsId\":2,\"itemId\":2,\"num\":2},{\"goodsId\":3,\"itemId\":3,\"num\":3}]";
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:urlString]];
 // Set post method
[request setHTTPMethod:@"POST"];
 // Set header to accept JSON request
[request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];

 // And finally, add it to HTTP body and job done.
[request setHTTPBody:[jsonString dataUsingEncoding:NSUTF8StringEncoding]];

AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
manager.responseSerializer.acceptableContentTypes = [NSSet setWithObjects:@"application/json", @"text/json", @"text/javascript",@"text/html", nil];
manager.requestSerializer = [AFJSONRequestSerializer serializer];
AFHTTPRequestOperation *operation = [manager HTTPRequestOperationWithRequest:request success:^(AFHTTPRequestOperation * _Nonnull operation, id  _Nonnull responseObject) {
    NSLog(@"%@",responseObject);
} failure:^(AFHTTPRequestOperation * _Nonnull operation, NSError * _Nonnull error) {
    NSLog(@"出错了,%@",error);
}];
[operation start];