angularjs with seo

index.js

exports.index = function(req, res){

  if (req.query._escaped_fragment_ !== undefined) {

    if (req.query._escaped_fragment_[0] === '/') {
        req.query._escaped_fragment_ = req.query._escaped_fragment_.substring(1);
    }

    if (req.query._escaped_fragment_[req.query._escaped_fragment_.length - 1] === '/') {
      req.query._escaped_fragment_ = req.query._escaped_fragment_.substring(0, req.query._escaped_fragment_.length - 1);
    }

    var seo_filename = req.query._escaped_fragment_.replace(/\//g, '_');

    res.render('snapshots/' + seo_filename + '.html');

  } else {
    res.render('index-ng');
  }

};