json - htmlBody swift 的 json 格式错误

Question

当我尝试从字典创建 json 时，我得到一个错误的格式，用分号代替 json 的逗号

let jsonData = try? JSONSerialization.data(withJSONObject: params)

参数是字典。我尝试使用选项:.prettyPrinted 但相同

result 
{
   "key": "value";
   "key": "value"
}
instead of 
{
   "key": "value",
   "key": "value"
}

我试图从一个文件中读取，但结果与分号相同:(

更新这是完整的代码:

let params: Dictionary<String, String> = ["country":"A"
    ,"language":"A"
    ,"query":"some query"
    ,"context": "null"]
let baseURL = "someURL"
let url = URL(string: baseURL)!
var request = URLRequest(url: url)
request.httpMethod = "POST"
do {
    request.httpBody = try JSONSerialization.data(withJSONObject: params, options: .prettyPrinted)
    print(try? JSONSerialization.jsonObject(with: request.httpBody!))

} catch let error {
    print(error.localizedDescription)
}

这是输出:

Optional({
    context = null;
    country = A;
    language = A;
    query = "some query";
})

可选的不是问题，而是分号

let json = try! JSONSerialization.jsonObject(with: request.httpBody!, options: .allowFragments)

输出:

{
    context = null;
    country = A;
    language = A;
    query = "some query";
}

Answer 1

这一行解决了我的问题:

request.addValue("application/json", forHTTPHeaderField: "Content-Type")