WinForms 的支持跨域的测试程序

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using System;
using System.Diagnostics;
using System.IO;
using System.Net;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading;
using System.Windows.Forms;namespace SimpleHttpServer_cors
{public partial class Form1 : Form{private HttpListener listener;private Thread listenerThread;private bool isStopping = false; // 标志位，用于指示服务是否正在停止public Form1(){InitializeComponent();this.FormClosing += Form1_FormClosing; // 订阅窗体关闭事件txtIPAddress.Text = GetLocalIP();}private void btnStartService_Click(object sender, EventArgs e){string ipAddress = txtIPAddress.Text;string port = txtPort.Text;listener = new HttpListener();listener.Prefixes.Add($"http://{ipAddress}:{port}/");listenerThread = new Thread(StartListener);listenerThread.Start();MessageBox.Show("服务已启动");}private void StartListener(){listener.Start();while (listener.IsListening){try{var context = listener.GetContext();ThreadPool.QueueUserWorkItem(o => HandleRequest(context));}catch (HttpListenerException){// 监听器已停止break;}}}private void HandleRequest(HttpListenerContext context){string responseString = string.Empty;if (context.Request.HttpMethod == "GET" && context.Request.Url.AbsolutePath == "/getapi/getadate/test2"){responseString = "{\"sites\":[{\"name\":\"菜鸟教程\",\"get_url\":\"www.runoob.com\"},{\"name\":\"google\",\"get_url\":\"www.google.com\"},{\"name\":\"微博\",\"get_url\":\"www.weibo.com\"}]}";}else if (context.Request.HttpMethod == "POST" && context.Request.Url.AbsolutePath == "/postapi/test1"){using (var reader = new StreamReader(context.Request.InputStream, context.Request.ContentEncoding)){string requestData = reader.ReadToEnd();Console.WriteLine($"Received POST data: {requestData}");}responseString = "{\"sites\":[{\"name\":\"菜鸟教程\",\"post_url\":\"www.runoob.com\"},{\"name\":\"google\",\"post_url\":\"www.google.com\"},{\"name\":\"微博\",\"post_url\":\"www.weibo.com\"}]}";}//跨域的context.Response.Headers.Add("Access-Control-Allow-Origin", "*");context.Response.Headers.Add("Access-Control-Allow-Methods", "GET, POST, OPTIONS");context.Response.Headers.Add("Access-Control-Allow-Headers", "Content-Type");byte[] buffer = Encoding.UTF8.GetBytes(responseString);context.Response.ContentLength64 = buffer.Length;context.Response.OutputStream.Write(buffer, 0, buffer.Length);context.Response.OutputStream.Close();}private void btnStopService_Click(object sender, EventArgs e){StopService();}private void StopService(){if (listener != null && listener.IsListening){isStopping = true;listener.Stop();listener.Close();listenerThread.Join();MessageBox.Show("服务已暂停");}}private void Form1_FormClosing(object sender, FormClosingEventArgs e){StopService(); // 确保在窗体关闭时停止服务}/// <summary>/// 获取当前使用的IP/// </summary>/// <returns></returns>public string GetLocalIP(){string result = RunApp("route", "print", true);Match m = Regex.Match(result, @"0.0.0.0\s+0.0.0.0\s+(\d+.\d+.\d+.\d+)\s+(\d+.\d+.\d+.\d+)");if (m.Success){return m.Groups[2].Value;}else{try{System.Net.Sockets.TcpClient c = new System.Net.Sockets.TcpClient();c.Connect("www.baidu.com", 80);string ip = ((System.Net.IPEndPoint)c.Client.LocalEndPoint).Address.ToString();c.Close();return ip;}catch (Exception){return null;}}}/// <summary>/// 运行一个控制台程序并返回其输出参数。/// </summary>/// <param name="filename">程序名</param>/// <param name="arguments">输入参数</param>/// <returns></returns>public string RunApp(string filename, string arguments, bool recordLog){try{if (recordLog){Trace.WriteLine(filename + " " + arguments);}Process proc = new Process();proc.StartInfo.FileName = filename;proc.StartInfo.CreateNoWindow = true;proc.StartInfo.Arguments = arguments;proc.StartInfo.RedirectStandardOutput = true;proc.StartInfo.UseShellExecute = false;proc.Start();using (System.IO.StreamReader sr = new System.IO.StreamReader(proc.StandardOutput.BaseStream, Encoding.Default)){Thread.Sleep(100);           //貌似调用系统的nslookup还未返回数据或者数据未编码完成，程序就已经跳过直接执行//txt = sr.ReadToEnd()了，导致返回的数据为空，故睡眠令硬件反应if (!proc.HasExited)         //在无参数调用nslookup后，可以继续输入命令继续操作，如果进程未停止就直接执行{                            //txt = sr.ReadToEnd()程序就在等待输入，而且又无法输入，直接掐住无法继续运行proc.Kill();}string txt = sr.ReadToEnd();sr.Close();if (recordLog)Trace.WriteLine(txt);return txt;}}catch (Exception ex){Trace.WriteLine(ex);return ex.Message;}}}
}

需要在防火墙的规则中添加对应的端口：
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在另外一个电脑中访问：
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1：启动服务
2：展示一下另外一个电脑的IP地址
3：在浏览器中进行请求
4：请求完成显示信息

使用的html文件源码
需要修改代码中的IP地址：localhost 修改为服务器的IP地址。

<!DOCTYPE html>
<html>
<head><title>CORS Test</title>
</head>
<body><button onclick="fetchData()">Fetch Data</button><div id="result"></div><script>function fetchData() {fetch('http://localhost:18792/getapi/getadate/test2').then(response => response.json()).then(data => {document.getElementById('result').innerText = JSON.stringify(data, null, 2);}).catch(error => console.error('Error:', error));}</script>
</body>
</html>