Get HTTP::uri in HTTP_RESPONSE

Here's what I'm trying to do. I send a request to pool A. If and only if pool A returns a 404 code, I need to rewrite the path and send the request to pool B. No matter what pool B responds with, return it to the client.

 

 

So, in the HTTP_REQUEST section, we save off the [HTTP::path] into the variable $mypath. In the HTTP_RESPONSE section, we have:

 

 

 
 when HTTP_RESPONSE { 
     if { $::DEBUG }{ 
         log "respcode -> [HTTP::status]'" 
         log "host -> [HTTP::host]" 
     } 
     if { ([HTTP::status] == 404) } { 
         if { $mypath ends_with "/" }{ 
             set mypath [string range 0 [string length $mypath]-1 $mypath] 
             append .html $mypath 
         } 
         HTTP::path $mypath 
         if { $::DEBUG }{ 
             log "retruri -> $mypath" 
         } 
         pool B 
     } 
 } 
 

 

 

The problem comes in the line

 

HTTP::path $mypath

 

 

THe error is:

 

01070151:3: Rule [myrule] error: line 34: [command is not valid in current event context (HTTP_RESPONSE)] [HTTP::path $mypath] 
 

 

 

How can I change the path/uri so I can submit a request to pool B without forcing a redirect?

 

 

Tom