NodeJS和TLS,获取客户端证书

我在测试 Node.JS 和 TLS 并且正在创建一个简单的服务器和客户端。 这似乎很管用:

server.js:

const tls = require('tls');
const fs = require('fs');

const options = {
  key: fs.readFileSync('./server-certs/server.key'),
  cert: fs.readFileSync('./server-certs/server.crt'),
  rejectUnauthorized: false,
  requestCert: true
};

const server = tls.createServer(options, (socket) => {
  console.log('server connected',
              socket.authorized ? 'authorized' : 'unauthorized');

  console.log(socket.getPeerCertificate(true).raw);

  socket.write('welcome!\n');
  socket.setEncoding('utf8');
  socket.pipe(socket);
});
server.listen(8000, () => {
  console.log('server bound');
});

const tls = require('tls');
const fs = require('fs');

const options = {
  key: fs.readFileSync('./client-certs/client.key'),
  cert: fs.readFileSync('./client-certs/client.crt')
};

const socket = tls.connect(8000, options, () => {
  console.log('client connected',
              socket.authorized ? 'authorized' : 'unauthorized');
  process.stdin.pipe(socket);
  process.stdin.resume();
});
socket.setEncoding('utf8');
socket.on('data', (data) => {
  console.log(data);
});
socket.on('end', () => {
  console.log('server ends connection');
});

和 server.js 我打印出客户证书:

console.log(socket.getPeerCertificate(true).raw);

但是做 cat client.crt

-----BEGIN CERTIFICATE-----
MIICsDCCAZgCCQC8miOEYnXCXDANBgkqhkiG9w0BAQsFADAaMQswCQYDVQQGEwJV
...
MHBcIlA2R3ssgfhlcSJcaR59LKA=
-----END CERTIFICATE-----

有可能吗 server.js 要从客户端证书获取该字符串?