how to rewrite fallback page

I think I missed the original point then. If you want to transparently rewrite requests so that the client gets "maintenance page" content when the default pool of the VIP is down, you can use a rule like this (Click here😞

 
   when RULE_INIT {   
  
       Use a prefix for the path that does not already exist in the application 
      set ::maintenance_prefix "/maintenance/" 
  
       The default maintenance page 
      set ::maintenance_page "maintenance.html" 
   }   
   when CLIENT_ACCEPTED {   
  
       Save the name of the default pool on the VIP 
      set default_pool [LB::server pool] 
   }   
   when HTTP_REQUEST {   
  
       Check if there aren't any active members in the default pool 
      if { [active_members $default_pool] < 1 } {  
  
          Primary members are unavailable.  Check if the URI has not already been rewritten. 
         if {not ([HTTP::path] starts_with $::maintenance_prefix)}{   
  
             Rewrite the URI to the maintenance prefix/maintenance page (/maintenance/maintenance.html)   
            HTTP::uri "$::maintenance_prefix$::maintenance_page" 
         }   
          Use the maintenance pool 
         pool maintenance_pool  
  
      } else {  
  
          Use the VIP's default pool 
         pool $default_pool  
      }  
   } 
 

Aaron