When you need to acquire a public server certificate in PEM format from a web server and you do not have OpenSSL tools then you can use one “hidden” feature of Google Chrome.
Just open HTTPS URL in Google Chrome. You’ll see an error:
Your connection is not private. NET::ERR_CERT_COMMON_NAME_INVALID
Do not click on Advanced or Reload.
Just click letters NET::ERR_CERT_COMMON_NAME_INVALID and PEM certificate will appear directly in the browser.
Now you can copy PEM encoded chain and paste it to your text editor.