Using Irules to mimic apache Virtual hosts

@bcallahan, yes you could do something like this:

[getfield [domain [HTTP::host] 2] 1]

or

[lindex [split [HTTP::host] .] end-1]

Either of these would take string a string value from HTTP::host of www.site1.com and return only site1

So the rule could be consolidated to:

 
 when HTTP_REQUEST { 
   HTTP::header replace Host "www.apacheserver.com" 
   HTTP::uri "/[getfield [domain [HTTP::host] 2] 1][HTTP::uri] 
 } 
 

With this approach, you might build a class of acceptable websites to compare against to keep noise from hitting your servers. Same principle as Hoolio suggested with the default case in the switch.

HTH...Jason