How to redirect HTTP to HTTPS Using .htaccess

Redirect All Web Traffic

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

Redirect Only a Specific Domain

RewriteEngine On
RewriteCond %{HTTP_HOST} ^yourdomain\.com [NC]
RewriteCond %{SERVER_PORT} 80
RewriteRule ^(.*)$ https://www.yourdomain.com/$1 [R,L]

Redirect Only a Specific Folder

RewriteEngine On
RewriteCond %{SERVER_PORT} 80
RewriteCond %{REQUEST_URI} folder
RewriteRule ^(.*)$ https://www.yourdomain.com/folder/$1 [R,L]

Note: Replace “yourdomain” with your actual domain name wherever required. Also, in case of the folder, replace /folder with the actual folder name.

Ví dụ

RewriteEngine On
RewriteCond %{HTTP_HOST} ^api.dothanhlong\.org [NC]
RewriteCond %{SERVER_PORT} 80
RewriteRule ^(.*)$ https://api.dothanhlong.org/$1 [R,L]

Preference

https://www.freecodecamp.org/news/how-to-redirect-http-to-https-using-htaccess/