Is there a way to enable https support in wordpress without plugins?

Question

Digital certificates

I specify the protocol in the path settings , the site works (somewhat incorrectly, but the problem is that the http protocol is hardcoded in the default template), but there is no access to the admin panel - "The site has redirected too many times."
How to solve the problem without plugins?

Answer 1

The final algorithm for me turned out like this:
1. I specify the protocol in the path settings
2. I add $_SERVER['HTTPS']='on' to wp-config.php;
3. I clean cookies.