Citrix Systems 9.2 manual Redirecting a Query, Redirecting Http to Https, Appendix C, 247

Appendix C Tutorial Examples of Advanced Policies for Rewrite 247

Redirecting a Query

This example describes how to create a Rewrite action and Rewrite policy that redirects a query to the proper URL. The example assumes that the request contains a Host header set to www.example.com and a GET method with the string /query.cgi?server=5. The redirect extracts the domain name from the host header and the number from the query string, and redirects the user’s query to the server Web5.example.com, where the rest of the user’s query is processed.

Note: Although the following commands appears on multiple lines, you should enter them on a single line without line breaks.

To redirect a query to the appropriate URL using the command line

1.To create a Rewrite action named act_redirect_query that replaces the HTTP server hostname with the internal server name, type:

add rewrite action act_redirect_query REPLACE q#http.req.header("Host").before_str(".example.com")' '"Web" + http.req.url.query.value("server")#

2.To create a Rewrite policy named pol_redirect_query, type the following commands at the NetScaler command prompt.. This policy detects connections, to the Web server, that contain a query string. Do not apply this policy to connections that do not contain a query string:

add rewrite policy pol_redirect_query q#http.req.header("Host").eq("www.example.com") && http.req.url.contains("?")' act_redirect_query#

3.Bind your new policy globally.

Since this Rewrite policy is highly specific and should be run before any other Rewrite policies, it is advisable to assign it a high priority. If you assign it a priority of 1, it will be evaluated first.

Redirecting HTTP to HTTPS

This example describes how to rewrite Web server responses to find all URLs that begin with the string “http” and replace that string with “https”. You can use this to avoid having to update Web pages after moving a server from HTTP to

HTTPS.