We have an application that is protected using Keycloak and a user can access this application through a web front. After login the user can use the functionality of the application. The application is also exposed through REST API's and is protected via keycloak as part of the application and accessible only after login into the main application.

We have a 

(Step 1) Javascript application (retrieving data from) -> 

(Step 2) Business Application exposed as REST API (REST API has to make calls to backend Application mentioned above) -> 

(Step 3) BackEnd Application Server + REST API.

Directly accessing the BackEnd Application Server works fine but when we need to call the REST API from another REST service which is authenticated via Keycloak we have issues.

We used the existing sample to try and do a POC but not sure what is the best approach to solve this issue. The part from (Step 1) to (Step 2) works and the REST API is protected using BEARER token. The (Step 2) to (Step 3) is a problem as in (Step 2) we only have the BEARER token and the BackEnd Application is protected using the full keycloak configuration. So The BackEnd Application service is not authenticating by sending in only the BEARER token in the header which is a full keycloak installation (work as only a web service).

Thanks

Sam