The dot metacharacter (".") does not match newlines. See perlre for the /s modifier.

As an aside, your code is not really helpful as it includes a reference to a module that I don't have, ID::Utilities, and calls some method in there. If you're certain that the ->get method returns the correct HTML, why reference that method at all? Simply directly assign the HTML value in a test program, if only to eliminate misbehaviour of the ->get method, or of the remote end.