text: const app = require('http');
  const fs = require('fs');
  const path = require('path');
  
  const privateKey = fs.readFileSync(path.join(__dirname, './ca/private.pem'), 'utf8');
  const certificate = fs.readFileSync(path.join(__dirname, './ca/ca.cer'), 'utf8');
  const credentials = {key: privateKey, cert: certificate};
  
  const server = app.createServer((req, res) => {
      const data = {
          code: 200,
          msg: 'success'
      };
      res.end(JSON.stringify(data))
  });
  
  server.listen('3000', () => {
      console.log('running on 3000')
  });
  