C# API代理示例

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using System;
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using System.IO;
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using System.Net;
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using System.Text;
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using System.Web.Script.Serialization;
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class ApiProxyDemo
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{
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    static string apiUrl = "http://ip.16yun.cn:817/myip/pl/<ORDER_ID>/?s=<ORDER_SIGN>&u=<USER>&format=json";
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    static string HttpGet(string url)
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    {
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        var req = (HttpWebRequest)WebRequest.Create(url);
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        req.Method = "GET";
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        using (var resp = (HttpWebResponse)req.GetResponse())
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        using (var sr = new StreamReader(resp.GetResponseStream(), Encoding.UTF8))
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        {
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            if (resp.StatusCode != HttpStatusCode.OK)
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                throw new Exception($"API错误: {(int)resp.StatusCode}");
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            return sr.ReadToEnd();
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        }
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    }
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    static void VisitWithProxy(string ip, int port)
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    {
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        var proxy = new WebProxy($"http://{ip}:{port}");
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        var req = (HttpWebRequest)WebRequest.Create("https://httpbin.org/ip");
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        req.Proxy = proxy;
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        using (var resp = (HttpWebResponse)req.GetResponse())
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        using (var sr = new StreamReader(resp.GetResponseStream(), Encoding.UTF8))
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        {
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            Console.WriteLine(sr.ReadToEnd());
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        }
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    }
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    static void Main()
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    {
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        var body = HttpGet(apiUrl);
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        var js = new JavaScriptSerializer();
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        dynamic arr = js.Deserialize<object>(body);
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        if (((object[])arr).Length == 0) throw new Exception("API 返回为空");
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        var first = (System.Collections.Generic.Dictionary<string, object>)((object[])arr)[0];
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        string ip = (string)first["ip"];
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        int port = Convert.ToInt32(first["port"]);
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        VisitWithProxy(ip, port);
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    }
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}