WILDCARD SUBDOMAIN HTTP REDIRECT TO HTTPS

Hi there,

I'm using the Multisite and wildcard, and I setup the SSL on my domain. I'm also set up .htaccess to let website can force SSL.

If I enter the http://domain.com, it will auto redirect to https://domain.com, but If I enter the http://subdomain.domain.com, it will auto redirect to https://domain.com.

How can I fixed it, let it can do that when I enter the http://subdomain.domain.com, then it will auto redirect to https://subdomain.domain.com??

My site: seobook.xyz, Test subdomain: seo.seobook.xyz

My .htaccess:

# BEGIN HTTPS
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{HTTPS} off
RewriteRule ^(.*)$ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]
</IfModule>
# END HTTPS

RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]

# add a trailing slash to /wp-admin
RewriteRule ^wp-admin$ wp-admin/ [R=301,L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]
RewriteRule ^(wp-(content|admin|includes).*) $1 [L]
RewriteRule ^(.*\.php)$ $1 [L]
RewriteRule . index.php [L]