text: const getFollowing  = (req, res) => {
  	res.send({username: req.params.user || "yl128", following: ["yl128test","guest"]})
  }
  
  const putFollowing = (req, res) => {
  	res.send({username: req.params.user || "yl128", following: ["yl128test","guest", req.params.user]})
  }
  
  const delFollowing = (req, res) => {
  	res.send({username: req.params.user || "yl128", following: [ "yl128test"]})
  }
  
  module.exports = app => {
       app.get('/following/:user?', getFollowing)
       app.put('/following/:user',  putFollowing )
       app.delete('/following/:user', delFollowing )
  }