text: // 实现gzip或deflate压缩，进行性能优化
  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());
    }
  
  }