Piping a knox S3 http response (an input stream) to an output file, reliably detecting error and invoking a completion callback

gistfile1.txt

      var res = // Any input stream
      var out = fs.createWriteStream(localPath);
      res.pipe(out);
      var dead = false;
      function die(err) {
        if (!dead) {
          dead = true;
          res.end();
          out.end();
          return callback(err);
        }
      }
      res.on('error', function(err) {
        return die(err);
      });
      out.on('error', function(err) {
        return die(err);
      });
      out.on('end', function() {
        if (!dead) {
          return callback(null);
        }
      });