text: const {createGzip, createDeflate} = require('zlib')
  
  module.exports = (rs, req, res) => {
    const acceptEncoding = req.headers['accept-encoding']
    if (!acceptEncoding || !acceptEncoding.match(/\b(gzip|deflate)\b/)) {
      return rs
    } else if (acceptEncoding.match(/\bgzip\b/)) {
      res.setHeader('content-encoding', 'gzip')
      return rs.pipe(createGzip())
    } else if (acceptEncoding.match(/\bdeflate\b/)){
      res.setHeader('content-encoding', 'deflate')
      return rs.pipe(createDeflate())
    }
  }
  