arukas 樱花免费docker容器，可以安装linux系统，但是每隔一段时间会重启，重启以后IP地址和映射到公网的端口都会变，获取IP和端口，我研究了很久终于找到了C#获取IP和端口的办法，用来搭建梯子很不错哦。
//Framework版本必须是4.5以上的
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;//必须要，不然无法访问https
string urlAddr = @"https://app.arukas.io/api/services/……appid……";
HttpWebRequest myReq = (HttpWebRequest)HttpWebRequest.Create(urlAddr);
myReq.Method = "GET";
myReq.ContentType = "application/json";
string username = "……Token……";
string password = "……Secret……";
//注意这里的格式哦，为 "username:password"
string usernamePassword = username + ":" + password;
string code = Convert.ToBase64String(Encoding.ASCII.GetBytes(usernamePassword));
myReq.Headers.Add("Authorization", "Basic " + code);
HttpWebResponse response = (HttpWebResponse)myReq.GetResponse();
StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8);
string content = reader.ReadToEnd();
JObject MyData = JsonConvert.DeserializeObject<JObject>(content);
object resultStr = MyData["data"]["attributes"]["port-mappings"][0][0]["host"];
Regex reg = new Regex(@"\d{1,3}-\d{1,3}-\d{1,3}-\d{1,3}");
Match mc = reg.Match(resultStr.ToString());
string ipStr = mc.ToString().Replace('-', '.');
string oldPort = MyData["data"]["attributes"]["port-mappings"][0][0]["container-port"].ToString();
string newPort = MyData["data"]["attributes"]["port-mappings"][0][0]["service-port"].ToString();
HttpContext.Current.Response.Write(ipStr + ":" + newPort + "(" + oldPort + ")");