A simple HTTP server that echoes all incoming requests to stdout and replies with HTTP 200 OK.

echo.js

var http = require('http');

var port = process.argv[2] || 8888;

http.createServer(function(request,response){
  console.log('request start');
  console.log(request.method, request.url, request.httpVersion);
  console.log('headers',request.headers);
  request.on('data',function(chunk){
    process.stdout.write(chunk.toString());
  });
  
  request.on('end',function(){
    response.writeHead(200);
    response.end();
    console.log('request end');
  });
}).listen(port, function() {
  console.log('listening on',port);
});