TcpAndHTTP.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net;
using System.Net.Sockets;
using System.Net.Http;

namespace StarWarsClient
{
    class Program
    {
        static void Server(string[] args)
        {

            Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            socket.Blocking = false;
            IPEndPoint endPoint = new IPEndPoint(IPAddress.Any, 7777);
            socket.Bind(endPoint);
            socket.Listen(10);

            Dictionary<Socket, byte[]> dataToSend = new Dictionary<Socket, byte[]>();

            List<Socket> knownSockets = new List<Socket>();

            List<Socket> socketsWaitingForWrite = new List<Socket>();

            // add myself
            knownSockets.Add(socket);

            while (true)
            {
                List<Socket> readSockets = new List<Socket>(knownSockets);
                Socket.Select(readSockets, null, null, -1);
                Console.WriteLine("{0} sockets ready for read", readSockets.Count);
                foreach (Socket readySocket in readSockets)
                {
                    // myself ?
                    if (readySocket == socket)
                    {
                        Socket newClient = socket.Accept();
                        newClient.Blocking = false;
                        knownSockets.Add(newClient);
                        Console.WriteLine("{0} sockets to monitor", knownSockets.Count);
                    }
                    // client socket ready, recv data
                    else
                    {
                        byte[] data = new byte[4096];
                        int rlen = readySocket.Receive(data);
                        if (rlen <= 0)
                        {
                            knownSockets.Remove(readySocket);
                        }
                        else
                        {
                            Console.WriteLine(Encoding.ASCII.GetString(data, 0, rlen));
                            // potentially blocked
                            int wlen = readySocket.Send(data, 0, rlen, SocketFlags.None);
                            if (wlen < rlen)
                            {
                                byte[] remainingData = new byte[rlen - wlen];
                                Buffer.BlockCopy(data, wlen, remainingData, 0, remainingData.Length);
                                dataToSend[readySocket] = remainingData;
                                // not enough bytes sent
                                socketsWaitingForWrite.Add(readySocket);
                            }
                        }
                    }
                }
            }
        }

        static void StarWars(string[] args)
        {

            Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            IPAddress[] addresses = Dns.GetHostAddresses("towel.blinkenlights.nl");
            Console.WriteLine(addresses[0]);
            socket.Connect(addresses, 23);
            while (true)
            {
                byte[] data = new byte[4096];
                int rlen = socket.Receive(data);
                Console.WriteLine(rlen);
                string message = Encoding.ASCII.GetString(data, 0, rlen);
                Console.WriteLine(message);
            }
        }

        static void Main(string[] args)
        {

            Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            IPEndPoint endPoint = new IPEndPoint(IPAddress.Any, 7777);
            socket.Bind(endPoint);
            socket.Listen(10);

            while (true)
            {
                Socket newClient = socket.Accept();
                string request = "";
                while (true)
                {

                    byte[] data = new byte[4096];
                    int rlen = newClient.Receive(data);
                    if (rlen <= 0)
                    {
                        break;
                    }
                    request += Encoding.ASCII.GetString(data, 0, rlen);
                    if (request.Contains("\r\n\r\n"))
                    {
                        break;
                    }
                }

                // if i am here the request is complete
                string response = "HTTP/1.0 200 OK\r\nContent-Type: text/html\r\nConnection: close\r\n\r\n<h1>AIV Cacca</h1><hr/><img src='http://fulmyne.it/Wood%20Carving/Immagini%20di%20servizio/paginiz.JPG' />";
                newClient.Send(Encoding.ASCII.GetBytes(response));
                newClient.Close();
            }
        }

        static void HttpClient(string[] args)
        {

            Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            IPAddress[] addresses = Dns.GetHostAddresses("fulmyne.it");
            Console.WriteLine(addresses[0]);
            socket.Connect(addresses, 80);
            string httpRequest = "GET /Wood%20Carving/Immagini%20di%20servizio/paginiz.JPG HTTP/1.0\r\nHost: fulmyne.it\r\n\r\n";
            socket.Send(Encoding.ASCII.GetBytes(httpRequest));
            while (true)
            {
                byte[] data = new byte[4096];
                int rlen = socket.Receive(data);
                if (rlen <= 0)
                {
                    break;
                }
                string message = Encoding.ASCII.GetString(data, 0, rlen);
                Console.WriteLine(message);
            }
            Console.ReadLine();
        }

        static void HttpClient2(string[] args)
        {
            WebRequest request = WebRequest.Create("https://www.aiv01.it/wp-content/uploads/2018/11/AIVlogo-img1.png");
            WebResponse response = request.GetResponse();
            
        }
    }
}