获取＆＃34;无效的授权标头值格式＆＃34;在Swift中使用Alamofire执行https请求

Question

代码是：

Alamofire.request(
    "https://...",
    method: .post,
    parameters: nil,
    encoding: URLEncoding.default,
    headers: [
        "Authorization": "Basic <client_id>:<client_secret>",
        "Content-Type": "application/x-www-form-urlencoded"
    ]
).responseString({ (response) in
    print(response)
})

打印语句打印：

{
    "error":"invalid_request",
    "error_description":"invalid authorization header value format"
}

The document声明标头参数应为：

  

授权：设置为Basic <base64 encoded "clientId:clientSecret">

     

内容类型：application / x-www-form-urlencoded

我在这里做错了什么？