server {
    listen       443 ssl;
    server_name  myserver.com;
    ssl on;

    ssl_certificate      /usr/local/etc/nginx/ssl/myserver.com/fullchain.pem;
    ssl_certificate_key  /usr/local/etc/nginx/ssl/myserver.com/privkey.pem;

    ssl_client_certificate  /usr/local/etc/nginx/ssl/letsencrypt-CA/DSTRootCAX3.crt;
    ssl_verify_client on;

    location / {
        proxy_pass http://127.0.0.1:4433;
    }

var fs = require('fs');
var https = require('https');
var options = {
    hostname: 'myserver.com',
    port: 8443,
    path: '/',
    method: 'GET',
    cert: fs.readFileSync('myclient.com/cert.pem'),
    key: fs.readFileSync('myclient.com/privkey.pem'),
    ca: fs.readFileSync('myclient.com/DSTRootCAX3.crt'),
};
var req = https.request(options, function (res) {
    res.on('data', function (data) {
        process.stdout.write(data);
    });
});
req.end();
req.on('error', function (e) {
    console.error(e);
});