Envoy Golang L7 Extension

[asialea]

Title: Access Filter State Keys

Description:
Hi all, I am trying to access the keys in filter state using FilterState().GetString(). I am unable to figure out what the naming convention for these keys are. All of my attempts have come back with an empty string. I am pretty sure these keys exist as they are being set/accessed from other filters in the chain, for example the access logger. I have also tried using the well known filter state keys here with no luck.

Any help would be appreciated.

[optional Relevant Links:]
https://github.com/envoyproxy/envoy/blob/main/contrib/golang/filters/http/source/go/pkg/http/filter.go#L306
https://www.envoyproxy.io/docs/envoy/latest/configuration/advanced/well_known_filter_state#well-known-filter-state