get_allowed_return_urls (OpenID::TrustRoot)

    # File lib/openid/trustroot.rb, line 91
        def TrustRoot.get_allowed_return_urls(relying_party_url)
          rp_url_after_redirects, return_to_urls = services.get_service_endpoints(
            relying_party_url, _extract_return_url)

          if rp_url_after_redirects != relying_party_url
            # Verification caused a redirect
            raise RealmVerificationRedirected.new(
                    relying_party_url, rp_url_after_redirects)
          end

          return return_to_urls
        end