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());
      }
  };
  