TypeError: res.connection.getPeerCertificate is not a function

[isaced]

What version of Bun is running?

1.1.38+bf2f153f5

What platform is your computer?

Darwin 23.6.0 arm64 arm

What steps can reproduce the bug?

The code snippet fetch-ssl.ts attempts to retrieve the peer's SSL certificate information using res.connection.getPeerCertificate(). However, when running the script with Bun (bun run fetch-ssl.ts), an error occurs:

get ssl info error：  7 |             port: 443,
 8 |             method: 'GET',
 9 |             rejectUnauthorized: false
10 |         };
11 |         const req = https.request(options, (res) => {
12 |             const data = res.connection.getPeerCertificate();
                                             ^
TypeError: res.connection.getPeerCertificate is not a function. (In 'res.connection.getPeerCertificate()', 'res.connection.getPeerCertificate' is undefined)
      at /Users/isaced/Downloads/network-test/fetch-ssl.js:12:41
      at onceWrapper (node:events:165:55)
      at emit (node:events:73:22)
      at node:http:1006:60

This error indicates that the getPeerCertificate method is not available on the connection property of the response object (res) in the Bun environment.

On the other hand, running the same code with Node.js (node fetch-ssl.js) produces the expected output, retrieving the certificate information:

ssl info： {
  subject: [Object: null prototype] { CN: 'www.google.com' },
  issuer: [Object: null prototype] {
    C: 'US',
    O: 'Google Trust Services',
    CN: 'WR2'
  },
  subjectaltname: 'DNS:www.google.com',
  infoAccess: [Object: null prototype] {
...

Code:

const https = require('https');

function getCertificateInfo(hostname) {
    return new Promise((resolve, reject) => {
        const options = {
            hostname,
            port: 443,
            method: 'GET',
            rejectUnauthorized: false
        };
        const req = https.request(options, (res) => {
            const data = res.connection.getPeerCertificate();
            resolve(data);
        });
        req.on('error', (error) => {
            reject(error);
        });
        req.end();
    });
}

getCertificateInfo('www.google.com')
    .then(info => {
        console.log('ssl info：', info);
    })
    .catch(error => {
        console.error('get ssl info error：', error);
    }); 

What is the expected behavior?

No response

What do you see instead?

No response

Additional information

No response