Force HTTPS and WWW for domain and only HTTPS for subdomains HTACESS
snippet in htaccess

Force HTTPS and WWW for domain and only HTTPS for subdomains HTACESS

user5704

RewriteEngine On 

# for subdomains
RewriteCond %{HTTPS} !=on
RewriteCond %{HTTP_HOST} !^(www\.)?domain\.com$ [NC]
RewriteCond %{HTTP_HOST} ^(?:www\.|)(.*)$ [NC]
RewriteRule ^.*$ https://%1%{REQUEST_URI} [R,L]

# for main domains
RewriteCond %{HTTPS} !=on [OR]
RewriteCond %{HTTP_HOST} ^domain\.com$ [NC]
RewriteRule ^.*$ https://www.domain.com%{REQUEST_URI} [R,L]