Explain what the code does

[gajus]

Can someone with understanding of https and streams explain me whats going on here?

node-mitm-proxy/proxy.js

Lines 140 to 159 in 864c252

	server.addListener('upgrade', function(req, socket, upgradeHead) {
	var proxy = net.createConnection(that.options.mitm_port, 'localhost');
	proxy.on('connect', function() {
	socket.write( "HTTP/1.0 200 Connection established\r\nProxy-agent: Netscape-Proxy/1.1\r\n\r\n");
	});
	// connect pipes
	proxy.on( 'data', function(d) { socket.write(d) });
	socket.on('data', function(d) { try { proxy.write(d) } catch(err) {}});
	proxy.on( 'end', function() { socket.end() });
	socket.on('end', function() { proxy.end() });
	proxy.on( 'close',function() { socket.end() });
	socket.on('close',function() { proxy.end() });
	proxy.on( 'error',function() { socket.end() });
	socket.on('error',function() { proxy.end() });
	});

[gajus]

To start with, it could be written as:

server.addListener('upgrade', function(req, socket, upgradeHead) {
  var proxy = net.createConnection(that.options.mitm_port, 'localhost');

  proxy.on('connect', function() {
    socket.write( "HTTP/1.0 200 Connection established\r\nProxy-agent: Netscape-Proxy/1.1\r\n\r\n");

    proxy.pipe(socket);
    socket.pipe(proxy);
  });
});

or am I missing something?