Secondary auth - guidance and configuration help

[Ramachandra Bhaskar]

Hello
We are having a legacy system(say a.b.c.d)   which uses http basic authentication (username/password)Currently we are using nginx ingress controller to pass all the requests coming to webserver(say 1.2.3.4)  using kubernetes "auth-url" annotation to the legacy system and if successful we are forwarding to our application server.(say w.s.x.c)

We want to do few things 
we want a consolidated nginx server(/container) which can use do secondary authentication with legacy system and also cache successful requests.is that possible ? We want to reduce number of hits going to legacy system for authentication thats our end goal
https://docs.nginx.com/nginx/admin-guide/security-controls/configuring-subrequest-authentication/#https://docs.nginx.com/nginx/admin-guide/content-cache/content-caching/
RegardsBhaskar
   
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