RewriteEngine On

# If behind reverse proxy (some shared hostings), trust X-Forwarded-Proto
RewriteCond %{HTTP:X-Forwarded-Proto} !https [NC]
RewriteCond %{HTTPS} !=on
RewriteRule ^ https://%{HTTP_HOST}%{REQUEST_URI} [R=301,L]

# Force non-www on already HTTPS URL
RewriteCond %{HTTP_HOST} ^www\.(.+)$ [NC]
RewriteRule ^ https://%1%{REQUEST_URI} [R=301,L]