auth_proxy_example.js

var _writeHead = res.writeHead; // Store the original function
res.writeHead = function(statusCode, headers) {
  res.writeHead = _writeHead; // Put the original back
  if (statusCode === 401) {
    // Change a 401 statusCode to a 403 in order to prevent browser's BASIC AUTH dialog from appearing.
    // This allows the Backbone app's login page to handle the credentials.
    _writeHead.call(res, 403, headers);
  } else {
    res.writeHead(statusCode, headers); // Call the original
  }
};