Rewrite http header to https and change the URI same time

Are you needing rewrites or redirects? I'm not quite sure from reading through the posts. Rewrites will only impact what happens behind the BIG-IP. Redirects will impact what the client sees. Assuming redirects, if both sites have valid certificates, a redirect won't throw ssl errors. Why not redirect from the original port 80 to the new port 443?

port 80 original virtual server
when HTTP_REQUEST {
  HTTP::redirect https://test2.mydomain.com[HTTP::uri]
}