AFHTTPSessionManager * manager = [AFHTTPSessionManager shareInstance];
    
    NSMutableDictionary * dict = [[NSMutableDictionary alloc]initWithDictionary:parameters];
    if ([dict.allKeys containsObject:@"token"]) {
        [manager.requestSerializer setValue:@"your token" forHTTPHeaderField:@"token"];
        //請求引數裡token的鍵值對去掉
        [dict removeObjectForKey:@"token"];
    }
    
    else
        [manager.requestSerializer setValue:@"application/x-www-form-urlencoded; charset=utf-8" forHTTPHeaderField:@"Content-Type"];
    
    manager.responseSerializer = [AFJSONResponseSerializer serializerWithReadingOptions:NSJSONReadingAllowFragments];
    [manager POST:url parameters:dict progress:^(NSProgress * _Nonnull uploadProgress) {
        
    } success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
        
    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
        
    }];