gopher.js

// gopher.js - a minimal gopher implementation using node.js
// Released under the 3 clause BSD license by Matt Croydon <mcroydon@gmail.com> (http://postneo.com)

var net = require('net');

net.createServer(function (socket) {
  socket.setEncoding("ascii");
  socket.on("data", function (data) {
    if (data === '\r\n') {
        console.log('Serving index.');
        socket.write('0About gopher.js' + '\t' + 'About' + '\t' + '127.0.0.1' + '\t' + '70');
        socket.write('.\r\n');
        socket.end();
    }
    else if (data === 'About\r\n') {
        console.log('Serving about file.');
        socket.write('Gopher.js is a minimal implementation of the gopher protocol using node.js.\r\n' +
        'To try it for yourself, run "node gopher.js" and connect to gopher://127.0.0.1 using a gopher client or a browser like Firefox.\r\n' +
        'You will likely need to run this command as root or with sudo.\r\n');
        socket.end();
    }
    else {
        console.log('Unknown: ' + data);
    }
  });
  socket.on("end", function () {
    console.log('Ending connection.');
    socket.end();
  });
}).listen(70, "127.0.0.1");

console.log('Server running at 127.0.0.1:70');