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System.Net.Sockets.TcpListener server = new System.Net.Sockets.TcpListener(System.Net.IPAddress.Loopback, 8080);
server.Start();
Console.WriteLine("Servidor TCP iniciado");
Console.WriteLine("Aguardando conexao de um cliente...");
TcpClient client = server.AcceptTcpClient();
Console.WriteLine("Um cliente conectou-se ao servidor");
System.IO.StreamWriter writer = new System.IO.StreamWriter(client.GetStream());
writer.Write("HTTP/1.0 200 OK\r\nContent-Type: text/plain; charset=UTF-8\r\n\r\nGoodbye, World!\r\n");
writer.Flush();
Console.WriteLine("Desligando servidor");
server.Stop();
Console.ReadKey();
When I open the browser and try to access the URL http://localhost:8080 I get the ERR_CONNECTION_RESET error. What am I doing wrong?
The problem is that you have an incorrect HTTP Packet, it does not contain a Content-Length, so the browser does not know what to read. Try the following code:
TcpListener server = new TcpListener(System.Net.IPAddress.Loopback, 8080);
server.Start();
Console.WriteLine("Wait for clients");
TcpClient client = server.AcceptTcpClient();
Console.WriteLine("Writing content");
string content = "Goodbye World!";
System.IO.StreamWriter writer = new System.IO.StreamWriter(client.GetStream());
writer.Write("HTTP/1.0 200 OK");
writer.Write(Environment.NewLine);
writer.Write("Content-Type: text/plain; charset=UTF-8");
writer.Write(Environment.NewLine);
writer.Write("Content-Length: "+ content.Length);
writer.Write(Environment.NewLine);
writer.Write(Environment.NewLine);
writer.Write(content);
writer.Flush();
Console.WriteLine("Disconnecting");
client.Close();
server.Stop();
Console.ReadKey();
                U were write. There was no Content-Length header in my response. Dont know how could I miss it.Thanks @caesay.
– m_junior
                Sep 18, 2015 at 8:37
                @m_junior Excellent, thanks for this! I had some issues getting a valid HTTP response for a simple listener in a PowerShell script and this worked perfectly (just some minor modifications to convert to PowerShell).
– PMental
                Sep 13, 2020 at 10:07
        
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