Caching support for External Authorization

[luvk1412]

Feature

Add caching support for External Auhorization. Caching could be enabled on all or certain http response status code from ext auth service with configurable ttl.

Use Case

We currently have a central auth service. Each service in our cluster talks to this for auth and also has a local cache. We wanted to remove auth handling in each service but using External Auhorization in its current state doesn't look viable because due to lack of any caching, we will face:

• an increased latency for each api call
• increased load on central auth service

Having a cache within envoy would ideally solve this.

Found a similar issue https://github.com/envoyproxy/envoy/issues/3023. Opening this here as well because the use case to me makes more sense and seems more logical for a gateway rather than a proxy.

[github-actions[bot]]

This issue has been automatically marked as stale because it has not had activity in the last 30 days.