How To Redirect Http To Https in .htaccess

Step 1. Enable mod_rewrite on your Apache web server.

Step 2. Create .htaccess file in root directory.

Step 3. Redirect All Web Traffic 
    <IfModule mod_rewrite.c>
        RewriteCond %{HTTPS} !=on [OR]
        RewriteCond %{HTTP_HOST} !^www\. [NC]
        RewriteRule ^(.*)$ https://www.yourdomain.com/$1 [R=301,L]
    </IfModule>

Step 4. Restart Apache Server  
        sudo service apache2 restart