'Does the relying party publish the return_to URL for this
response under the realm? It is up to the provider to set a
policy for what kinds of realms should be allowed. This
return_to URL verification reduces vulnerability to data-theft
attacks based on open proxies, cross-site-scripting, or open
redirectors.
This check should only be performed after making sure that the
return_to URL matches the realm.
@see: L{trustRootValid}
@raises openid.yadis.discover.DiscoveryFailure: if the realm
URL does not support Yadis discovery (and so does not
support the verification process).
@raises openid.fetchers.HTTPFetchingError: if the realm URL
is not reachable.  When this is the case, the RP may be hosted
on the user\'s intranet.
@returntype: bool
@returns: True if the realm publishes a document with the
return_to URL listed
@since: 2.1.0'

def returnToVerified(self):

    return verifyReturnTo(self.trust_root, self.return_to)
