Distribute load based on uri

I think Bhattman's example would work. But the downside to using a global counter is that it will prevent the VS from being "load balanced" across all of the TMM cores or CPUs (if you're on a CMP capable platform and LTM version). Another poster, Kev, came up with a simple solution for scenarios like this:

 http://devcentral.f5.com/Community/GroupDetails/tabid/1082223/aff/5/afv/topic/aft/1172658/afc/1196453/Default.aspx

when HTTP_REQUEST { 
   if { rand() > 0.02 } { 
      pool default-pool 
   } else { 
      pool marketing-pool 
   } 
} 

You could adapt this to your scenario:

 http://devcentral.f5.com/Community/GroupDetails/tabid/1082223/aff/5/afv/topic/aft/1172658/afc/1196453/Default.aspx

when HTTP_REQUEST {

    Check if URI is one we want to redirect
   if {[HTTP::uri] contains "search"}{

      if { rand() > 0.70 } {
         HTTP::redirect "http://uri1"
      } else { 
         HTTP::redirect "http://uri2"
      } 
   } 
}

Aaron