text: 
  var koa = require('koa');
  var escape = require('escape-html');
  
  var app = module.exports = koa();
  
  app.use(function* (next) {
    yield next;
    // add some logic here!
  })
  
  app.use(function* body() {
    this.response.body = 'this following HTML should be escaped: <p>hi!</p>';
  });
  