BIG-IP : irule syntax to construct url

Syntax looks fine for me. 8|

Write a

log local0. "https://$host[HTTP::uri]"

under the irule and check your logfile if the string looks like desired!

is it http or https virtual server?

if http, it is okay but if https, it will cause redirection loop because HTTP::redirect is outside if-condition.

 configuration

[root@ve11c:Active:In Sync] config  tmsh list ltm virtual bar
ltm virtual bar {
    destination 172.28.24.10:443
    ip-protocol tcp
    mask 255.255.255.255
    pool foo
    profiles {
        clientssl {
            context clientside
        }
        http { }
        tcp { }
    }
    rules {
        qux
    }
    source 0.0.0.0/0
    source-address-translation {
        type automap
    }
    vs-index 17
}
[root@ve11c:Active:In Sync] config  tmsh list ltm rule qux
ltm rule qux {
    when HTTP_REQUEST {
  set host [HTTP::host]
  if { not ([string tolower [HTTP::host]] starts_with "www.") } {
    set host "www.[HTTP::host]"
  }
  HTTP::redirect "https://$host[HTTP::uri]"
}
}

 test

[root@ve11c:Active:In Sync] config  curl -ik https://172.28.24.10 -H "Host: www.abc.com"
HTTP/1.0 302 Found
Location: https://www.abc.com/
Server: BigIP
Connection: Keep-Alive
Content-Length: 0