irule Troubleshooting:

for test purposes i simplified this part

log local0. "The LB choice is: $mypick"
                    set newuri [string map {/sorry.html/ /} [HTTP::uri]]
                    log local0. "The new URI is = $newuri"
                    HTTP::uri $newuri
                    eval "GET [HTTP::uri $newuri] HTTP/1.1\r\nHost: $mypick\r\n\r\n"
                    log local0. "The LB choice is: $mypick"
                    set newuri [string map {/sorry.html/ /} [HTTP::uri]]
                    log local0. "The new URI is = $newuri"
                    HTTP::uri $newuri
                    eval "GET [HTTP::uri $newuri] HTTP/1.1\r\nHost: $mypick\r\n\r\n"

to the following:

HTTP::uri "/wartung.html"
log local0. "[HTTP::uri] [LB::server addr]"

this had the effect, that the desired page was indeed delivered to the client, however additional graphics, would not be delivered due to the hardcoded request to the server. Is there an easy way to solve this problem with a redirect or what could be a good way get the additional content delivered?

here are the logs from the rule: Incoming URI = /Fehlerseite/wartungsarbeiten/logo_mit_claim.jpg Active members in pool_wwbtest_sorry are: {xxx.xxx.xxx.xxx 1080} The LB choice is: pool /Common/pool_wwbtest_sorry member xxx.xxx.xxx.xxx 1080 /sorry.html