Forum Discussion

Leslie_South_55's avatar
Leslie_South_55
Icon for Nimbostratus rankNimbostratus
Oct 17, 2008

Using LB_FAILED and change the URI w/o 302

I am trying to use the 'when LB_FAILED' to send requests a pool just for apologies. The issue is that the requests coming into the VS have crazy long URI strings like '/ABC/def/g/hij/klmno/' and my s...
application delivery
dev
devops
iRules
hooleylist's avatar
hooleylist
Icon for Cirrostratus rankCirrostratus
Oct 21, 2008
Of course... the client never knows about the maintenance URI as it's not being sent a redirect. So the Referer header value still shows the original URI it was making the request from. How about checking for the string "/maintenance_files/" in the requested URI and not rewriting those requests? Is it safe to assume that only the maintenance files will have that in the URI? 

 
   when LB_FAILED {   
      
      log local0. "[IP::client_addr]:[TCP::client_port]: Request for [HTTP::uri] from Referer '[HTTP::header Referer]' to pool failed, [LB::server pool]"   
      
       Check if this request was not generated from the maintenance page using the HTTP referer header   
      if {not ([HTTP::path] contains "/maintenance_files/")}{   
      
         log local0. "[IP::client_addr]:[TCP::client_port]: Referer wasn't the maintenance page.  Rewriting URI to maintenance page."   
         HTTP::uri "/maintenance.htm"   
      }  
      
       Send request to the apologies pool   
      LB::reselect pool pool_apologies_http   
      log local0. "[IP::client_addr]:[TCP::client_port]: Reselecting member from the apologies pool"   
   }

Aaron