Keepalive for Single web server with Multiple URLs

We require to configure CSS ( cisco 11500 series) switch configuration. Currently we have the settings mentioned below :
1. We have two IIS servers behind CSS switch hosting multiple websites for load balancing.
2. Keepalive type we are using is HTTP-HEAD
3. There is one virtual IP assigned to the CSS switch for all websites.
Now we have to provide the keep-alive URIs for the CSS switch. I am not sure which URI we have to provide for keepalive status check.
As per my understanding
1. there would be DNS entries for the websites pointing to the VIP of the CSS switch
e.g abc.com --> VIP
xyz.com --> VIP
aaa.com --> VIP
2. Name based virtual hosting to be configured on IIS server (i.e host header configuration)
3. We have to provide the URI for the keepalive prameters. As there are multiple websites are hosted on the server,firstly , is it possible in CSS switch to configure multiple keepalives for different websites ? secondly is it possible to give the complete URL (http://abc.com ) in the URI parameter of keepalive settings ? typically these settings are like
IP address : < IP address of Node >
URI : /index.html
I am not clear how this all settings will work. What is the ideal way or best practice of configuring the load balancing in the scenario of multiple websites to be hosted on IIS servers with CSS switch loadbalancer.
Is it correct to assign 1 VIP for multiple websites on server nodes?
Your inputs will be highly appreciated.
Thanks in Advance.

We have done this multiple ways.
1. we did port mapping on the backend.
server www1
ip address x.x.x.x
keepalive type http
keepalive port 80
keepalive uri "/lb.htm"
acitve
server www2
ip address x.x.x.x {same as above}
keepalive type http
keepalive port 81
keepalive uri "/lb.htm"
active
or via host header checking
2.
service www1-1
ip address x.x.x.x
keepalive type script ap-kal-httptag "www1-1 /lb.htm www1"
active
service www2-1
ip address x.x.x.x {same as above}
keepalive type script ap-kal-httptag "www2-1 /lb.htm www2"
active
With the script ap-kal-httptag, you will need to have dns entries that the CSS will be able to resolve to the individual web site addreses.
-Rich

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