variable getting reset during irule execution

I used your test code and host_num does exist. I don't ever see a host_num does not exist in my logs.

 

 

But my problem occurs in my irule like so:

 

 when HTTP_REQUEST { 
log local0. "here" 
set host_num 0 
if { [string tolower $uri] starts_with "/serv" } { 
      log local0. "prefix redirect initiated" 
      if { [string tolower $uri] matches_regex {serv[\d]+} } { 
               scan $uri /serv%d host_num 
               set path "/" 
               log local0. "uri match found $host_num" 
      } else { 
               scan $uri /serv%d%s host_num path 
               log local0. "uri match not found assert $host_num" 
      } 
      HTTP::uri $path 
} 

when LB_SELECTED { 
log local0. "LB here" 
if { $host_num != 0 } {
    redirect the request to the appropriate member 
           switch $host_num { 
                    1 {
                          LB::reselect pool SERV member 10.10.10.2 
                          log local0. "prefix redirect selecting /serv1" 
                        }
 } } 

 

 

 

My problem occurs when LB_SELECTED executes. For some reason $host_num is always being reset to 0.

 

 

It's almost like any user who tries to use the prefix redirect to select a specific server, will get the host_num variable set, but before the LB_SELECT function executes the session/connection is cleared and they get host_num = 0 or something.

 

 

Any ideas?