add a way to configure the `proxy_cache_*` [1] directive for external-auth.
The user-defined cache_key may contain sensitive information
(e.g. Authorization header).
We want to store *only* a hash of that key, not the key itself on disk.
[1] http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_cache_key
Signed-off-by: Moritz Johner <beller.moritz@googlemail.com>
add test for new auth-snippet annotation
document auth-snippet annotation
add e2e test for auth-snippet annotation
add log warning and update documentation
Adds the 'nginx.ingress.kubernetes.io/auth-request-redirect'
annotation, which allows the customization of the
'X-Auth-Request-Redirect' Header. Fixes: #1979
