Drupal 7 HTTPS Setup

Change the Base URL in Settings.php

$base_url = 'https://domainname.com';

and add the code in .htaccess

# Redirect to HTTPS
RewriteCond %{HTTPS} off
RewriteCond %{HTTP:X-Forwarded-Proto} !https
RewriteRule ^(.*)$ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]

Clear the cache and check it