irule replace and modify uri and response

If I understand you correctly, you need to alter the stream expression in your HTTP_RESPONSE event, based either on the pool that was selected or the URI you received, during the HTTP_REQUEST event. 

Note that you may need to capture that in a variable in the HTTP_REQUEST event, and check the variable in the HTTP_RESPONSE event, because you might only be able to use certain API functions inside certain events.

Something like:

when HTTP_REQUEST {
  set orig_uri [HTTP::uri]
  # the rest of your logic
}
when HTTP_RESPONSE {
  STREAM::disable
  if {([HTTP::status] == 200) && ([HTTP::header value Content-Type] contains "text") } {
    switch -glob -- [string tolower $orig_uri] {
      "/ris1*" {
        STREAM::expression {@http:@https:@ @/[Nn]ovaris@/ris1@}
      }
      "/ris2*" {
        STREAM::expression {@http:@https:@ @/[Nn]ovaris@/ris2@}
      }
      "/ris3*" {
        STREAM::expression {@http:@https:@ @/[Nn]ovaris@/ris3@}
      }
    }
    STREAM::enable
  }
}

(There are other optimisations that might shorten this, but you should get the gist)

Note that I have also changed the expression for your http/https rewrite to http:/https: (note the colon), so that any https:// URI returned by the downstream server is not rewritten to httpss://.

You may also need to handle a case-sensitive response back from the downstream server (I presume you would need to rewrite /Novaris or /novaris for instance).  To that end, you may need to make your stream search expression something like...

@/[Nn][Oo][Vv][Aa][Rr][Ii][Ss]@/ris1@

...so it handles upper- and lower-case.

Hi,

If the stream expression string starts or ends with space, it won't work.
It looks neater with space, but it shouldn't. 🙂

# This will work
STREAM::expression {@IE@Apache@ @Windows@Linux@}

# and this will work
STREAM::expression [list "@IE@Apache" "@Windows@Linux@"]

# but this will NOT work-- notice the space between the '{' and the '@'
STREAM::expression { @IE@Apache@ @Windows@Linux@ }

REF: https://clouddocs.f5.com/api/irules/STREAM__expression.html