HTTPS: Remove www. from hostname

www. is not explicitly removed from the display URL in the browser when the session is HTTPS

if you want to change display url, i think you have to use HTTP::redirect rather than HTTP::header.

 config

[root@ve11a: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 4
}
[root@ve11a:Active:In Sync] config  tmsh list ltm rule qux
ltm rule qux {
    when HTTP_REQUEST {
  if {([string tolower [HTTP::host]] starts_with "www.")} {
    HTTP::redirect "https://[string range [HTTP::host] 4 end][HTTP::uri]"
  }
}
}

 test

[root@ve11a:Active:In Sync] config  curl -Ik https://www.site1.com/something
HTTP/1.0 302 Found
Location: https://site1.com/something
Server: BigIP
Connection: Keep-Alive
Content-Length: 0