public Element requestSecurityTokenResponse(final String appliesTo) throws Exception {
        val action = isSecureConv ? namespace + "/RST/SCT" : null;
        return requestSecurityTokenResponse(appliesTo, action, "/Issue", null);
    }
Request security token response element.

@param appliesTo the applies to
@return the element
@throws Exception the exception
support/cas-server-support-ws-sts-api/src/main/java/org/apereo/cas/authentication/SecurityTokenServiceClient.java