Use res.end instead of this.body When redirect

Maybe should use res.end instead of this.body= ASAP.

  redirect: function(url, alt){
    // location
    if ('back' == url) url = this.ctx.get('Referrer') || alt || '/';
    this.set('Location', url);

    // status
    if (!statuses.redirect[this.status]) this.status = 302;

    // html
    if (this.ctx.accepts('html')) {
      url = escape(url);
      this.type = 'text/html; charset=utf-8';
      this.body = 'Redirecting to <a href="' + url + '">' + url + '</a>.';
      return;
    }

    // text
    this.type = 'text/plain; charset=utf-8';
    this.body = 'Redirecting to ' + url + '.';
  },

[fl0w]

I’m a little worried this could break the middleware chain? Would love to see some tests …

[yorkie]

I think a benchmark would be more helpful to see what’s the difference between them @fundon.