TpcClient downlad Url

CS029_Networking/8.TcpClient/.vscode/launch.json

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+{
+   // Use IntelliSense to find out which attributes exist for C# debugging
+   // Use hover for the description of the existing attributes
+   // For further information visit https://github.com/OmniSharp/omnisharp-vscode/blob/master/debugger-launchjson.md
+   "version": "0.2.0",
+   "configurations": [
+        {
+            "name": ".NET Core Launch (console)",
+            "type": "coreclr",
+            "request": "launch",
+            "preLaunchTask": "build",
+            // If you have changed target frameworks, make sure to update the program path.
+            "program": "${workspaceFolder}/bin/Debug/netcoreapp2.1/HttpClientExample.dll",
+            "args": [],
+            "cwd": "${workspaceFolder}",
+            // For more information about the 'console' field, see https://aka.ms/VSCode-CS-LaunchJson-Console
+            "console": "internalConsole",
+            "stopAtEntry": false
+        },
+        {
+            "name": ".NET Core Attach",
+            "type": "coreclr",
+            "request": "attach",
+            "processId": "${command:pickProcess}"
+        }
+    ]
+}

CS029_Networking/8.TcpClient/.vscode/tasks.json

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+{
+    "version": "2.0.0",
+    "tasks": [
+        {
+            "label": "build",
+            "command": "dotnet",
+            "type": "process",
+            "args": [
+                "build",
+                "${workspaceFolder}/HttpClientExample.csproj",
+                "/property:GenerateFullPaths=true",
+                "/consoleloggerparameters:NoSummary"
+            ],
+            "problemMatcher": "$msCompile"
+        },
+        {
+            "label": "publish",
+            "command": "dotnet",
+            "type": "process",
+            "args": [
+                "publish",
+                "${workspaceFolder}/HttpClientExample.csproj",
+                "/property:GenerateFullPaths=true",
+                "/consoleloggerparameters:NoSummary"
+            ],
+            "problemMatcher": "$msCompile"
+        },
+        {
+            "label": "watch",
+            "command": "dotnet",
+            "type": "process",
+            "args": [
+                "watch",
+                "run",
+                "${workspaceFolder}/HttpClientExample.csproj",
+                "/property:GenerateFullPaths=true",
+                "/consoleloggerparameters:NoSummary"
+            ],
+            "problemMatcher": "$msCompile"
+        }
+    ]
+}

CS029_Networking/8.TcpClient/HttpClientExample.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp2.1</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.AspNetCore.Server.WebListener" Version="1.1.4" />
+    <PackageReference Include="System.Text.Encoding.CodePages" Version="4.5.1" />
+  </ItemGroup>
+
+</Project>

CS029_Networking/8.TcpClient/Program.cs

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+using System;
+using System.Linq;
+using System.Net;
+using System.Threading.Tasks;
+using System.Text;
+using System.Net.Sockets;
+using System.Net.Http;
+using System.IO;
+using System.Net.Security;
+using System.Security.Cryptography.X509Certificates;
+
+namespace TCP
+{
+
+    class Program
+    {    
+        // Phương thức này gọi bởi RemoteCertificateValidationDelegate trong quá trình xác thức SSL
+        // chỉ dùng khi kết nối HTTPS
+
+        public static bool ValidateServerCertificate(
+              object sender,
+              X509Certificate certificate,
+              X509Chain chain,
+              SslPolicyErrors sslPolicyErrors)
+        {
+           Console.WriteLine("ValidateServerCertificate");
+           if (sslPolicyErrors == SslPolicyErrors.None)  return true;
+            Console.WriteLine("Certificate error: {0}", sslPolicyErrors);
+
+            // Do not allow this client to communicate with unauthenticated servers.
+            return false;
+        }
+
+        // Kết nối đến server Tpc bằng TcpClient, đọc nội dung trả về
+        public static  async Task ReadHtmlAsync(string url) {
+
+            using (var client = new TcpClient()) 
+            {
+                Console.WriteLine($"Start get {url}");
+                Uri uri = new Uri(url);
+
+                var hostAdress = await Dns.GetHostAddressesAsync(uri.Host);
+                IPAddress ipaddrress = hostAdress[0];
+                Console.WriteLine($"Host: {uri.Host}, IP: {ipaddrress}:{uri.Port}"); 
+                await client.ConnectAsync(ipaddrress.MapToIPv4(), uri.Port);
+                Console.WriteLine("Connected");
+                Console.WriteLine();
+
+
+                Stream stream;
+                if (uri.Scheme == "https")
+                {
+                    // SslStream
+                    stream = new SslStream(client.GetStream(),false, 
+                                           new RemoteCertificateValidationCallback (ValidateServerCertificate),
+                                           null);
+                   (stream as SslStream).AuthenticateAsClient(uri.Host);             
+                } 
+                else {
+                    // NetworkStream
+                    stream = client.GetStream(); 
+                }
+
+                Console.WriteLine($"Get Stream OK: {stream.GetType().Name}");
+
+
+                // Xem: /psr-7-chuan-giao-dien-thong-diep-http.html#HTTPRequest
+                StringBuilder header = new StringBuilder();
+                header.Append($"GET {uri.PathAndQuery} HTTP/1.1\r\n");
+                // header.Append($"GET {uri.PathAndQuery} HTTP/2\r\n");
+                header.Append($"Host: {uri.Host}\r\n");
+                header.Append($"\r\n");
+
+                Console.WriteLine("Request:");
+                Console.WriteLine(header); 
+
+                byte[]  bsend  = Encoding.UTF8.GetBytes(header.ToString());
+                await stream.WriteAsync(bsend, 0, bsend.Length);
+
+                await stream.FlushAsync(); 
+
+                Console.WriteLine("Send Message OK");
+
+
+                var ms = new MemoryStream(); 
+                byte [] buffer = new byte[255];
+                int bytes = -1;
+                do
+                {
+                    bytes = await stream.ReadAsync(buffer, 0, buffer.Length);
+
+                    // Lưu dữ liệu tải về vào ms
+                    ms.Write(buffer, 0, bytes); 
+
+                    Array.Clear(buffer, 0, buffer.Length);   
+
+                } while (bytes != 0);
+
+                Console.WriteLine($"Read OK");
+
+                ms.Seek(0, SeekOrigin.Begin);
+                var reader = new StreamReader(ms); 
+                string html = reader.ReadToEnd(); 
+                Console.WriteLine("Response:");
+                Console.WriteLine(html);
+
+            }
+        }
+        static async Task  Main(string[] args)
+        {
+            string url = "https://google.com.vn";
+            await ReadHtmlAsync(url);
+        }
+
+    }
+}