Persistence required; but not cookie and not IP based

Scenario:

 

 

Have 3 servers in a pool. Persistence is required; cookie or IP-based is not acceptable.

 

 

Suggested solution:

 

 

a) Node Select Expression (Universal)

 

b)

 

 

Stuck:

 

 

1) What can F5 read from an IIS web server?

 

2) If there was a unique ID (similar to session id) is there a way to persist to same node? Where can this unique ID be? (URI; Header; Content)

 

3) What would be the syntax to select a specific node based off of something in the Content or Header?

 

 

Nodes: 192.168.1.100:80; 192.168.1.101:80; 192.168.101:102:80

 

 

Using version 4.5.10.

 

 

Thanks in advance for the help!