Redirect via Round Robin

[root@ve10:Active] config  b rule myrule list
rule myrule {
   when RULE_INIT {
    Round robin counter
   set static::c 0

    Round robin node
    www1.url.com = 200.200.200.101
    www2.url.com = 200.200.200.111
    www3.url.com = 200.200.200.103
    www4.url.com = 200.200.200.113
   unset static::node
   set static::node(0) "200.200.200.101"
   set static::node(1) "200.200.200.111"
   set static::node(2) "200.200.200.103"
   set static::node(3) "200.200.200.113"
}

when HTTP_REQUEST {
    Pick up round robin node
   set try 0
   while { [LB::status node $static::node($static::c)] ne "up" and $try < [array size static::node]} {
      if { $static::c == [expr {[array size static::node] - 1}] } {
         set static::c 0
      } else {
         incr static::c
      }
      incr try
   }

    Action when all nodes are down
   if { $try == [array size static::node] } {
      HTTP::respond 200 content "sorry we are not ready" noserver
      return
   }

    Send HTTP redirection
   switch $static::c {
      0 { HTTP::redirect "http://www1.url.com" }
      1 { HTTP::redirect "http://www2.url.com" }
      2 { HTTP::redirect "http://www3.url.com" }
      3 { HTTP::redirect "http://www4.url.com" }
   }

    Move to next round robin node
   if { $static::c == [expr {[array size static::node] - 1}] } {
      set static::c 0
   } else {
      incr static::c
   }
}
}