ios - 为什么不能从一个 URL 获得响应？

Question

我正在使用 URLSession。我没有收到任何错误或响应。

它适用于一个网址。但是，它不能相互配合。

我也试过 percentencoding。但它也不起作用。

代码如下

let urlString = "https://stark-spire-93433.herokuapp.com/json"//This is not working
//let urlString = "https://jsonplaceholder.typicode.com/todos"//This is working
let config = URLSessionConfiguration.default
let session = URLSession(configuration: config)//URLSession.shared
var request = URLRequest(url: URL(string:urlString)!)
request.httpMethod = "GET"
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
request.httpBody = try? JSONSerialization.data(withJSONObject: [], options: [])
let task = session.dataTask(with: request, completionHandler: { data, response, error -> Void in
    print("response---",response)
    print("error--",error)
    if data != nil {
        let json = try? JSONSerialization.jsonObject(with: data!)
        print("JSOn",json)

    } else {
        print("error data is nil")
    }

})
task.resume()

Answer 1

代码太繁琐。

这就足够了

let url = URL(string:"https://stark-spire-93433.herokuapp.com/json")!
let task = URLSession.shared.dataTask(with: url) { data, response, error in
    guard let data = data else { print(error!); return }
    do {
        let json = try JSONSerialization.jsonObject(with: data)
        print("JSOn",json)

    } catch {
        print(error)
    }
}
task.resume()