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When integrating Istio with Keycloak for JWT-based authorization, the typical workflow involves clients obtaining a JWT (JSON Web Token) from Keycloak, which is then used to access services secured by Istio. Keycloak acts as an identity provider (IdP), issuing tokens that contain various claims about the authenticated user or client.
A JWT from Keycloak includes three parts: the header, payload, and signature. The payload carries the claims about the user or client, and it is used by Istio to make authorization decisions.
1. Header: This part of the token contains metadata about the token itself, such as the type of token and the signing algorithm used. For Keycloak, this often looks like:
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