Configure transparent redirection
When you configure transparent cache redirection, the Citrix ADC appliance evaluates all traffic it receives, to determine whether it is cacheable. This mode alleviates traffic along the delivery route and is often used when the cache server resides on the backbone of an ISP or carrier.
By default, cacheable requests are sent to a cache server, and non-cacheable requests to the origin server. For example, when the Citrix ADC appliance receives a request that is directed to a web server, it compares the HTTP headers in the request with a set of policy expressions. If the request does not match the policy, the appliance forwards the request to a cache server. If the request does match a policy, the appliance forwards the request, unchanged, to the web server.
For details on how to modify this default behavior, see “Direct policy hits to the cache instead of the origin.”
To configure transparent redirection, first enable cache redirection and load balancing, and configure edge mode. Then, create a cache redirection virtual server with a wildcard IP address (*), so that this virtual server can receive traffic coming to the appliance on any IP address the appliance owns. To this virtual server, bind cache redirection policies that describe the types of requests that should not be cached. Then, create a load balancing virtual server that will receive traffic from the cache redirection virtual server for cacheable requests. Finally, create a service that represents a physical cache server and bind it to the load balancing virtual server.
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