.htaccess

SetEnvIf Request_URI ^/allowed_url noauth=1
 
AuthUserFile /.../example.com/.htpasswd
AuthName "Please authorize yourself"
AuthType Basic
Order Deny,Allow
Satisfy any
Deny from all
Require valid-user
Allow from env=noauth

RewriteCond %{HTTPS} !=on
RewriteCond %{HTTP_HOST} !^www\.(.+)$ [NC]
RewriteRule ^(.*)$ http://www.%1/$1 [R=301,L]

• převzato z http://www.techiecorner.com/97/redirect-to-maintenance-page-during-upgrade-using-htaccess/

Options +FollowSymlinks
RewriteEngine on
RewriteCond %{REQUEST_URI} !/maintenance.html$
RewriteCond %{REMOTE_HOST} !^888\.888\.888\.888
 
RewriteRule $ /maintenance.html [R=302,L]

• převzato z http://google-cz.blogspot.com/2011/01/jak-se-vyporadat-s-planovanou-odstavkou.html

header('HTTP/1.1 503 Service Temporarily Unavailable');
header('Retry-After: Sat, 8 Oct 2011 18:27:00 GMT');