Looking at my classpath, there do seem to be a few sun implementations of this, including `sun.net.www.protocol.https.DefaultHostnameVerifier` and `com.sun.deploy.security.CertificateHostnameVerifier`.  Do you know if either of these could be used in place of this?  Since this already depends on `sun.security.util.HostnameChecker`, it seems that using a built in Sun implementation might also be ok.