URL redirection

Check out the example irules here:

https://devcentral.f5.com/wiki/iRules.pool.ashx

especially this one seems exactly like what you want to do

--

when HTTP_REQUEST {
   if { [HTTP::uri] ends_with ".gif" } {
      if { [LB::status pool my_Pool member 10.1.2.200 80] eq "down" } {
         log "Server $ip $port down!"
         pool fallback_Pool
      } else {
         pool my_Pool member 10.1.2.200 80
      }
   }
}

--

With that many URI's you may want to use a switch statement. The base URL with no URI would end up being the last matching statement.

https://devcentral.f5.com/questions/host-with-multiple-uri

when HTTP_REQUEST { 
    switch -glob [string tolower [HTTP::path]] {
        "*/uri-1/*" -
        "*/uri-2/*" {
            HTTP::redirect "https://www.mysite.com[HTTP::uri]"
            or use:
             pool my_pool-1
            return
            }
        "*/uri-3/*" {
            pool my_pool-2
        return
        }
        }
        default {
            if {[string tolower [HTTP::uri]] equals "/"} {
                HTTP::redirect "https://www.myothersite.com[HTTP::uri]"  
                return
            }
        }
}

HTH,