private Http signHttpAuthRequest(final Http request, final Map<String, String> parameters) {
        parameters.forEach(request::addParam);
        return signHttpUserPreAuthRequest(request);
    }
This is {@link BaseDuoSecurityAuthenticationService}.

@author Misagh Moayyed
@since 5.1.0
support/cas-server-support-duo-core/src/main/java/org/apereo/cas/adaptors/duo/authn/BaseDuoSecurityAuthenticationService.java