ASP.NET Core NE8实现HTTP Upgrade和HTTP CONNECT代理服务器

看到一个文章[Go] 不到 100 行代码实现一个支持 CONNECT 动词的 HTTP 服务器
在NET8中如何实现
创建项目为MiniApi

编辑Program.cs文件。

var builder = WebApplication.CreateSlimBuilder(args);var app = builder.Build();// 将HTTP请求通过协议升级机制转为远程TCP请求（WebSocket分支，Nginx支持） 
app.Map("/http2tcp", async (context) =>
{var upgradeFeature = context.Features.Get<Microsoft.AspNetCore.Http.Features.IHttpUpgradeFeature>();if (upgradeFeature != null && upgradeFeature.IsUpgradableRequest){context.Features.Get<Microsoft.AspNetCore.Http.Timeouts.IHttpRequestTimeoutFeature>()?.DisableTimeout();context.Response.Headers.Connection = Microsoft.Net.Http.Headers.HeaderNames.Upgrade;context.Response.Headers.Upgrade = "http2tcp/1.0";Stream stream = await upgradeFeature.UpgradeAsync();using System.Net.Sockets.TcpClient tcpClient = new System.Net.Sockets.TcpClient();await tcpClient.ConnectAsync(System.Net.IPEndPoint.Parse("127.0.0.1:1000"));using System.Net.Sockets.NetworkStream network = tcpClient.GetStream();var taskX = network.CopyToAsync(stream);var tsakY = stream.CopyToAsync(network);Task.WaitAny(taskX, tsakY);}
});// 将HTTP请求通过CONNECT方法转为TCP请求（CONNECT分支）主流浏览器都支持  https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/CONNECT
app.MapMethods("", new[] { HttpMethods.Connect }, async (context) =>
{var auth = context.Request.Headers["Proxy-Authorization"];await context.Response.Body.FlushAsync();var socket = context.Features.Get<Microsoft.AspNetCore.Connections.Features.IConnectionSocketFeature>()!.Socket;var stream = new System.Net.Sockets.NetworkStream(socket);using var tcpClient = new System.Net.Sockets.TcpClient();await tcpClient.ConnectAsync(System.Net.IPEndPoint.Parse(context.Request.Host.Value));using var network = tcpClient.GetStream();var taskX = network.CopyToAsync(stream);var tsakY = stream.CopyToAsync(network);Task.WaitAny(taskX, tsakY);await socket.DisconnectAsync(true);socket.Close();
});app.Run();

HTTP Upgrade 客户端请求方式

GET http://127.0.0.1:5199/http2tcp HTTP/1.1
Connection: upgrade
Upgrade: example/1, foo/2
User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; WOW64; Trident/7.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E)
Accept-Encoding: gzip, deflate
Host: 127.0.0.1:5199

HTTP CONNECT 客户端请求方式

CONNECT 127.0.0.1:1000 HTTP/1.1
Host: 127.0.0.1:1000
Proxy-Authorization: basic aGVsbG86d29ybGQ=

如下是数据传输示意图。