How did swift make web requests - swift

Question

I`m a new swifter ,so can take me some help to use swift to make web requests,thanks. Why can't it be reviewed and submitted。
//创建请求体
let param = ["moblie":"18392387159"]
let data = try! JSONSerialization.data(withJSONObject: param, options: JSONSerialization.WritingOptions.prettyPrinted)
var string = "json="
let Str = String(data: data, encoding: String.Encoding(rawValue: String.Encoding.utf8.rawValue))
//拼接
string = string + Str!
let Url = URL.init(string: "http://huixin.smartdot.com:9901/GoComWebService/restful/GoComeRestful/getResetCode")
let request = NSMutableURLRequest.init(url: Url!)
request.timeoutInterval = 30
//请求方式，跟OC一样的
request.httpMethod = "POST"
request.httpBody = string.data(using: String.Encoding.utf8)
let session = URLSession.shared
let dataTask = session.dataTask(with: request as URLRequest) { (data, response, error) -> Void in
if (error != nil) {
return
}
else {
//此处是具体的解析，具体请移步下面
let json: Any = try! JSONSerialization.jsonObject(with: data!, options: [])
if let value = JSON(json)["status"].string {
print("状态是：\(value)")
}
print(json)
}
}
dataTask.resume()
i write like this , why it did not work !

Answer 1

I suggest you modify the following code
data is not recommended mandatory unpack ,I am here only to help you find the problem quickly to deal with this problem
do {
let dic = try JSONSerialization.jsonObject(with: data!, options: JSONSerialization.ReadingOptions.allowFragments)
print(dic)
} catch {
print(error)
}
Error returned here is
Error Domain = NSCocoaErrorDomain Code = 3840 "No value." UserInfo = {NSDebugDescription = No value.}
You may ask the parameters of the problem, check their own