Replace Host on Original HTTP Request

Hi Conor,

You could either replace the string within the HTTP::request variable:

   
   set orgRequest [string map {oldhost.example.com newhost.example.com} [HTTP::request]]  
   

Or you could track whether this is a retried request and then use HTTP::header replace Host "newhost.example.com":

   
   when CLIENT_ACCEPTED {   
       Track whether we're retrying the request   
      set retrying 0   
   }   
   when HTTP_REQUEST {   
      
       Check if some condition is true, where we want to potentially retry the request   
      if {$some_condition}{   
      
          Check if this is a retried request   
         if {$retry}{   
      
             Update the Host header value   
            HTTP::header replace  Host "newhost.example.com"   
      
             Specify a new destination for this request   
            node $new_ip $new_port   
      
         } else {   
            set orgRequest [HTTP::request]    
         }   
      }   
   }   
   when HTTP_RESPONSE {   
      
       Add logic for when to retry the request and set retry to 0 or 1 
   }   
   

I assume you're not saving the full request for every request? Doing so would unnecessarily use a lot of memory.

Aaron