fs appendFileSync appends twice

[noamso1]

every call to appendFileSync writes the string twice to the file!! what to do?
here's my code:

var http = require('http');
var fs = require('fs');

http.createServer(function (req, res) {
  fs.appendFileSync('1.txt', 'A', 'utf8');
  res.write('123');
  res.end();
}).listen(9999);

[leeight]

try console.log(req.url), maybe your server received two request?

[noamso1]

THANKS LEEIGHT.... you are right. its because the browser asked for favicon.ico.... i added:

if (req.url === '/favicon.ico') {r.end();}

case is closed!