ProxyPass Irule --- reverse proxy

Can you explain what you want to happen with non-/directory/ requests? Do you want them to go to the same server(s) as /directory/ requests? Or separate server(s)? Do you know if the host header needs to be rewritten?

Here's a guess at what you mean. This assumes you want /directory/ requests sent to one set of server(s) and non-/directory/ requests to go to the virtual server's default pool. I'm also rewriting the URI from /directory/ to /new-directory/ and updating the host header value to the server IP and port.

when CLIENT_ACCEPTED {

 Save the name of the VS default pool
set default_pool [LB::server pool]

}
when HTTP_REQUEST {

 Check the requested URI
switch -glob [HTTP::uri] {
"/directory/*" {

 Select a custom pool for these requests
pool directory_pool

 Replace /directory/ with /new-directory/ in the URI
HTTP::uri [string map {/directory/ /new-directory/} [HTTP::uri]]

 Track that we will replace the Host header on these requests
set rewrite_host 1
}
default {
pool $default_pool
set rewrite_host 0
}
}
}
when HTTP_REQUEST_SEND {

 Rewrite the host header to the selected server IP:port
if {$rewrite_host}{
clientside {
HTTP::header replace Host "[IP::server_addr]:[TCP::server_port]"
}
}
}

Aaron