You changed your domain name and you want to redirect all requests to the new domain? You can create such a redirect by adding a few lines in the site’s .htaccess file.
RewriteEngine on
RewriteCond %{HTTP_HOST} ^domain.com$ [OR]
RewriteCond %{HTTP_HOST} ^www.domain.com$
RewriteRule ^(.*)$ "https://newdomain.com/$1" [R=301,L]
To redirect with a 301 HTTP response ( Moved Permanently ), use R=[301,L] on the last line.
To redirect with a 302 HTTP response ( Moved Temporarily ), use R=[302,L] on the last line.
The L indicates that this is the last rule from the .htaccess file that will be processed.
301 Moved Permanently
RFC 1945
The requested resource has been assigned a new permanent URL and
any future references to this resource should be done using that
URL.
302 Moved Temporarily
RFC 1945
The requested resource resides temporarily under a different URL.
Resources:
RFC 1945
This does not redirect http://www to https://newdomain.com