Как в nginx сделать https проксирование для всех сайтов?

user www-data;
worker_processes 4;
pid /var/run/nginx.pid;

events {
        worker_connections 768;
        # multi_accept on;
}

http {
    include       mime.types;
    default_type  application/octet-stream;
    sendfile        on;
    keepalive_timeout  65;

server{
        listen       80;
location / {
    proxy_pass http://$http_host$request_uri;
    proxy_set_header Host $http_host;
    resolver 8.8.8.8;
}
}
}