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Force HTTPS
RewriteEngine on
RewriteCond %{HTTPS} !on
RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI}

Force www
RewriteEngine on
RewriteCond %{HTTP_HOST} ^htmlg\.com [NC]
RewriteRule ^(.*)$ http://www.htmlg.com/$1 [L,R=301,NC]

Force non-www
RewriteEngine on
RewriteCond %{HTTP_HOST} ^www\.htmlg\.com [NC]
RewriteRule ^(.*)$ http://htmlg.com/$1 [L,R=301]

Custom Error Pages
ErrorDocument 500 "Sorry, something went wrong!"
ErrorDocument 401 https://htmlg.com/404/
ErrorDocument 404 404error.html

Redirect Entire Site
Redirect 301 / https://htmlg.com/

Permanent Page Redirect
Redirect 301 /oldlink.html https://htmlg.com/help/
Redirect 301 /oldlink https://htmlg.com/about/

Alias Directory
RewriteEngine On
RewriteRule ^source_directory/(.*) target_directory/$1

Remove .php Extension
RewriteEngine On
RewriteCond %{SCRIPT_FILENAME} !-d
RewriteRule ^([^.]+)$ $1.php [NC,L]

Block IP Address
Order deny,allow
Allow from all
Deny from 123.123.123.123
Deny from 123.123.123.123

Allow Access From Only One IP
# Require all denied
# Require ip 123.123.123.123