Redirect all traffic to https://www.

.httaccess

# Redirect http to https
RewriteEngine On
RewriteCond %{SERVER_PORT} 80
RewriteRule ^(.*)$ https://www.example.com/$1 [R,L]

# Redirect non-www to www
RewriteEngine On
RewriteCond %{HTTP_HOST} ^example.com$ [NC]
RewriteRule (.*) https://www.example.com/$1 [R=301,L]