php - accessed through HTTPS, but HTTPS, HTTP_USESSL, SERVER_PORT in $_SERVER cannot be judged

Question

The return values ​​are null, null, and 80. There are 2 machines for load balancing. What are the possible reasons?

Answer 1

It should be that you made https on nginx, and then reverse proxy to the backend nginx+php-fpm, right?

Your nginx needs to tell

php-fpm: Hi, I used https. How to tell, see below

fastcgi_param  HTTPS 'on';