The simplest solution is to add a redirect in the reverse proxy. Decide, which url you like and then redirect e.g. from
www.myhost.com to myhost.com.
That way, you only need one virtual host entry. This is probably the best solution. If possible, sites should have just one url.
Other ways are more complicated. You could implement your own filter that does whatever is necessary. Or maybe you can use a Wrapper for VirtualHostLocalService that treats
www.myhost.com and myhost.com the same.
Note: Liferay 7.3 allows you to set multiple virtual hosts.
