.htaccess SSL HTTPS For One Domain Hosted on Shared Server - .htaccess

Question

I have searched like crazy to find an answer for this... so here goes the scenario:
I have a server that hosts several domains. However, the main domain should be the only one loading as HTTPS.
Whenever I try the following code:
RewriteEngine On
RewriteCond %{SERVER_PORT} 80
RewriteRule ^(.*)$ https://www.MAINDOMAIN.com/$1 [R,L]
The rest of the domains change from http://www.site.com to HTTP(S)://www.MAINDOMAIN.com/FolderName and so on.
How can I go about this?

Answer 1

The most straightforward way to do this is to have only one virtual host, www.maindomain.com, available on port 443, and have only www.maindomain.com:80 redirect to https.
<VirtualHost *:80>
ServerName www.maindomain.com
Redirect / https://www.maindomain.com/
</VirtualHost>
<VirtualHost *:443>
ServerName www.maindomain.com
SSLEngine on
...
</VirtualHost>
<VirtualHost *:80>
ServerName www.site.com
...
</VirtualHost>
No RewriteRule is needed. If you want you can also have HTTPS on the other sites redirect to HTTP:
<VirtualHost *:443>
ServerName www.site.com
SSLEngine on
Redirect / http://www.site.com/
</Virtualhost>
Otherwise https://www.site.com will be served by https://www.maindomain.com, since that will be the only virtual host available by HTTPS. That will make it the default virtual host for HTTPS, so it will serve all HTTPS requests.