301 redirect means code example
Example 1: 301 redirect htaccess
RewriteEngine On
RewriteBase /
RewriteRule ^(.*)$ http://domain2.com/$1 [L,R=301,NC]
Example 2: 301 redirect http to https
#For apache .htaccess
RewriteEngine On
RewriteCond %{HTTPS} off
RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI} [R=301,L]
Example 3: 301 redirect
#In .htaccess
Redirect 301 /old-page https://www.example.com/new-page