Untitled

var file = require('fs');
http.createServer(function (req, res) {
  res.writeHead(200, {'Content-Type': 'text/html'});
  var fd = file.open('default.html','w',function(err){
    if(err)throw err;
});
file.appendFile('default.html',"<p>Hi,this to inform you that i really don't care</p>",function(err){});
  return res.end();
}).listen(8080);

<!doctype>
<html lang="en">
<head>
    <title>File</title>
</head>
<body>
    <h1>
        Hi, EveryOne
    </h1>
</html>

<p>Hi,this to inform you that i really don't care</p>