Redirect HTTP to HTTPS Based upon URL

The matchclass command is used to lookup values in a data group. This isn't needed since you are using a single string comparison on HTTP::host.

Second thing is that you need the HTTP::host value instead of the HTTP::uri. The format of the full url is:

http://[HTTP::host][HTTP::uri]

http://abc.xyz.com/somepath

[HTTP::host] -> 'abc.xyz.com'

[HTTP::uri] -> '/somepath'

This should do it for you.

when HTTP_REQUEST {
  if { ! [HTTP::host] equals "abc.xyz.com" } {
    HTTP::redirect http://[HTTP::host][HTTP::uri]
  }
}

(I changed "contains" to "equals" assuming that was the full domain name. If you truely want any domain containing your "abc.xyz.com" then leave the contains in there.)

Also, make sure that you don't have this rule processing on http or you could get into an infinite loop.

-Joe