zerolengthbufferbug.js

var http = require('http');
var Buffer = require('buffer').Buffer;

http.createServer(function (req, res) {
  var buffer = new Buffer(0);
  res.writeHead(200,
    {'Content-Type': 'text/html',
    'Content-Length': buffer.length});
    res.end(buffer, 'binary');
  }
).listen(3000);

Related thread http://groups.google.com/group/nodejs/browse_thread/thread/f11c8cc79382f348