httpからhttpsへリダイレクト（2種）

ex)直接指定する
RewriteEngine on
RewriteCond %{HTTPS} off
RewriteRule ^(.*)$ https://example.com/$1 [R=301,L]


ex)HTTP環境変数を使用する
RewriteEngine on
RewriteCond %{HTTPS} off
RewriteRule ^(.*)$ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]

RewriteEngine on
RewriteCond %{HTTPS} off
RewriteRule ^(.*)$ https://ドメイン名/\ [R=301,L]

RewriteEngine on
RewriteCond %{HTTPS} off
RewriteRule ^(.*)$ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]