Вот же, английским по белому:
"...Keycloak Client Adapters makes it really easy to secure applications and services. We have adapters available for a number of platforms and programming languages, but if there's not one available for your chosen platform don't worry. Keycloak is built on standard protocols so you can use any OpenID Connect Resource Library or SAML 2.0 Service Provider library out there.
You can also opt to use a proxy to secure your applications which removes the need to modify your application at all..."