OAuth2 in web application connecting to multiple REST services? - web-services

How do I set up a web application with OAuth2 authentication, where the web application connects to two underlying REST services (through client-side JavaScript from the user's browser)?
I am controlling all servers, and I need to make sure that nobody accesses the web application and the REST services without authentication.
How should this be done?
Should I configure all three servers (the web application and the two REST services) using a single application id?
BTW:I plan to use IdentityServer4 as the authentication server.
Best regards,
Morten :-)

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Secure communication between two web service

In a application, we have two web services which interact with each other. Now as these web services are meant for internal processing that should not be exposed to external users. How can we secure these web services in way that user cannot access these two webservice but can access other web services.

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I use IntelliJ and I would like to see the traffic (requests, responses, headers, etc.) between the webapp backend (the client) and the web service endpoint.
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Note:
I have tried using the bundled REST Client but it is just meant to issue requests to a web service endpoint.
The chrome console is of no use either because it just monitor the traffic between the SPA and the webapp backend...
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Use the AppEngine URL Fetch Service to call your JBoss web services from your AppEngine app. Use the HTTPS option to secure the network connection. Furthermore create request headers and payload such as to satisfy whatever JBoss security requirements you can establish between JBoss and AppEngine (for example client user authentication).

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Have a look at this URL:
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Concerning SOAP WebServices, you can a lot of posts in this forum related to your question. In particular in User authenticate in SOAP I've mentioned that there several ways to authenticate the client.
Supposing that you want to authenticate the client by X.509 certificate. Then:
For JBossWS refer WS-SecurityOptions – X509 Certificate Token
For Metro/JAX-WS services refer Using JAX-WS-Based Web Services with SSL
For Apache CXF refer WS-Security
For Spring Security refer Spring Security With X.509 Certificate