Citrix Systems 9.2 Converting URL Variations into Canonical URLs, Converting Host Name Variations to Canonical Host Names

260 Citrix NetScaler Policy Configuration and Reference Guide
Converting URL Variations into Canonical URLs
On some Web servers you can have multiple URLs for a resource. Although the
canonical URLs should be used and distributed, other URLs can exist as shortcuts
or internal URLs. You can make sure that users see the canonical URL regardless
of the URL used to make an initial request.
In the following examples, the URL /~user is converted to /u/user.
Apache mod_rewrite solution for converting a URL
RewriteRule ^/~([^/]+)/?(.*) /u/$1/$2[R]
NetScaler solution for converting a URL
add responder action act1 redirect '"/u/"+HTTP.REQ.URL.AFTER_STR("/
~")' -bypassSafetyCheck yes
add responder policy pol1 'HTTP.REQ.URL.STARTSWITH("/~") &&
HTTP.REQ.URL.LENGTH.GT(2)' act1
bind responder global pol1 100
Converting Host Name Variations to Canonical Host
Names
You can enforce the use of a particular host name for reaching a site. For
example, you can enforce the use of www.example.com instead of example.com.
Apache mod_rewrite solution for enforcing a particular host name for sites
running on a port other than 80
RewriteCond %{HTTP_HOST} !^www.example.com
RewriteCond %{HTTP_HOST} !^$
RewriteCond %{SERVER_PORT} !^80$
RewriteRule ^/(.*) http://www.example.com:%{SERVER_PORT}/$1
[L,R]
Apache mod_rewrite solution for enforcing a particular host name for sites
running on port 80
RewriteCond %{HTTP_HOST} !^www.example.com
RewriteCond %{HTTP_HOST} !^$
RewriteRule ^/(.*) http://www.example.com/$1 [L,R]