HTTP request rewriting

Instead of saving a string, I would recommend using an integer or boolean value.

For example, instead of:

  
  set target_pool "search_pool"  
  

use:

  
  set rewrite_reponse 1  
  

and then in the response event simply do

  
  if { $rewrite_reponse } {  
  

This is quite a bit faster than string comparing when you don't need to.