Error log "operation not supported....." when applied secondary irule to VS

Hi Patrik , Thanks for reminding ! Below is the irule.

 HTTPS_retry_prod
when CLIENT_ACCEPTED {
   Save the name of the virtual server default pool
  set def_pool [LB::server pool]
 On each new TCP connection track that we have not retried a request yet
  set max_retries [active_members $def_pool]
  set retries 0
}
when HTTP_REQUEST {
 Only save the request headers if this is not a retried request
  if { $retries == 0 } {
    set request_headers [HTTP::request]
if { [HTTP::method] eq "POST" } {
       Trigger collection for up to 1MB of data
      if { [HTTP::header "Content-Length"] ne "" && [HTTP::header "Content-Length"] <= 1048576 } {
        set content_length [HTTP::header "Content-Length"]
      } else {
        set content_length 1048576
      }

       Check if $content_length is not set to 0
      if { $content_length > 0 } {
        HTTP::collect $content_length
      }
    }
  }
}
when HTTP_REQUEST_DATA {
   do stuff with the payload
  set payload [HTTP::payload]
   Append HTTP payload to HTTP request header to form a complete HTTP post request (request + payload) 
  append request_headers [HTTP::payload [HTTP::payload length]]
}
when LB_SELECTED {
 Select a new pool member from the VS default pool if we are retrying this request
  if { $retries > 0 } {
    + log selected member when retry
    log local0. "Retry selected : server=[IP::server_addr] client=[IP::client_addr]"
    LB::reselect pool $def_pool
  }
}
when LB_FAILED {
  log local0. "LB fail : server=[IP::server_addr] client=[IP::client_addr]"
  LB::reselect pool $def_pool
}
when HTTP_RESPONSE {
 Check for server errors
  if { [HTTP::status] >= 500 } {
     Server error, retry the request if we have not already retried more times than there are pool members
    incr retries
    log local0. "Response error : server=[IP::server_addr] client=[IP::client_addr] retry=$retries max_retries=$max_retries"
if { $retries < $max_retries } {
       log retry header
      log local0. "HTTP retry : server=[IP::server_addr] client=[IP::client_addr] header=[substr $request_headers 0 '?']"
      HTTP::retry $request_headers
       Exit this event from this iRule so we do not reset retries to 0
      return
    }
    + retry reach maximum no. of time, log the event
    log local0. "Retry maximum : server=[IP::server_addr] client=[IP::client_addr] max_retries=$max_retries"
  }
   If we are still in the rule we are not retrying this request
  set retries 0
}

 isolation_redirect
when HTTP_REQUEST {
  if { [class match [IP::client_addr] equals "lms_support_data_group"] } {
  log local0. "Client [IP::client_addr] allowed"
  } else {
  HTTP::redirect "http://www.polyu.edu.hk/elearning/announcement/"
  log local0. "Client [IP::client_addr] isn't allowed , Action redirect"
}
}