How to resolve the algorithm Hello world/Web server step by step in the C# programming language

Published on 12 May 2024 09:40 PM
#C_Sharp

How to resolve the algorithm Hello world/Web server step by step in the C# programming language

Table of Contents

Problem Statement

The browser is the new GUI !

Serve our standard text   Goodbye, World!   to   http://localhost:8080/   so that it can be viewed with a web browser. The provided solution must start or implement a server that accepts multiple client connections and serves text as requested. Note that starting a web browser or opening a new window with this URL is not part of the task. Additionally, it is permissible to serve the provided page as a plain text file (there is no requirement to serve properly formatted HTML here). The browser will generally do the right thing with simple text like this.

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Hello world/Web server step by step in the C# programming language

The provided C# code consists of two independent programs:

  1. GoodByeWorld Program:

    • This program implements a simple TCP server that listens for incoming client connections on port 8080.
    • When a client connects, it sends a pre-defined HTML message to the client (<html>...Goodbye, world!...</html>).
    • The message is encoded using ASCII encoding and sent over the socket connection.
    • Once the message is sent, the socket connection is disconnected.

  2. Webserver Program:

    • This program implements a web server using the Nancy framework.
    • It defines a route for the root URL (/) that returns the message "Goodbye, world!" when accessed via HTTP GET.
    • It uses the Nancy self-hosting feature to start the web server on port 8080.
    • The program waits for user input (Press 'Enter' to exit) before shutting down the server.

In summary, the code consists of two distinct programs: a simple TCP server that sends a static message to clients and a web server that responds to HTTP GET requests with a custom message.

Source code in the csharp programming language

using System.Text;
using System.Net.Sockets;
using System.Net;

namespace WebServer
{
    class GoodByeWorld
    {        
        static void Main(string[] args)
        {
            const string msg = "<html>\n<body>\nGoodbye, world!\n</body>\n</html>\n";        
            const int port = 8080;
            bool serverRunning = true;

            TcpListener tcpListener = new TcpListener(IPAddress.Any, port);
            tcpListener.Start();

            while (serverRunning)
            {
                Socket socketConnection = tcpListener.AcceptSocket();
                byte[] bMsg = Encoding.ASCII.GetBytes(msg.ToCharArray(), 0, (int)msg.Length);
                socketConnection.Send(bMsg);
                socketConnection.Disconnect(true);
            }
        }
    }
}


namespace Webserver
{
  using System;
  using Nancy;
  using Nancy.Hosting.Self;

  public class HelloWorldModule : NancyModule
  {
    public HelloWorldModule()
    {
      this.Get["/"] = parameters => "Goodbye, world!";
    }

    public static void Main()
    {
      var uri = new Uri("http://localhost:8080");
      using (var host = new NancyHost(uri))
      {
        host.Start();
        Console.WriteLine("Web server is now running!");
        Console.WriteLine("Press 'Enter' to exit.");
        Console.ReadLine();
      }
    }
  }
}

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