protected Set<String> getMetadataLocationsForService(final SamlRegisteredService service, final CriteriaSet criteriaSet) {
        return org.springframework.util.StringUtils.commaDelimitedListToSet(
            SpringExpressionLanguageValueResolver.getInstance().resolve(service.getMetadataLocation()));
    }
This is {@link UrlResourceMetadataResolver}.

@author Misagh Moayyed
@since 5.2.0
support/cas-server-support-saml-idp-metadata/src/main/java/org/apereo/cas/support/saml/services/idp/metadata/cache/resolver/UrlResourceMetadataResolver.java