virtual server config question

Hello,

 

We are using an irule to forward traffic on certain destination url. Like the following:

 

 

when HTTP_REQUEST {

 

if { [HTTP::uri] equals "/foo" } {

 

HTTP::uri "/bar"

 

}

 

}

 

 

However when we apply the irule to our virutal server it complains with the following error:

 

 

HTTP_REQUEST event in rule (url_bypass) requires an associated HTTP or FASTHTTP profile on the virtual server

 

 

Can someone explain why we need a special http/fast http profile on our virtual server? Currently we are just doing l4 load balancing using performance l4 virtual server.

 

 

Also when we changed it to use the http/fast http profile, it complained we cant use persistence.

 

 

Thanks for any answers.