AWS request signing filter virtual host-specific config

Title: AWS request signing filter virtual host-specific config

Description:

I have Envoy deployed with a single TLS listener that is using virtual hosts. I need to tell each virtual host to use the typed_per_filter_config to apply the envoy.filters.http.aws_request_signing filter. However, when I apply the filter on the virtual host level, the following error is displayed:

The filter envoy.filters.http.aws_request_signing doesn’t support virtual host-specific configurations

Is there a technical reason this filter cannot be applied to a virtual host config? Technical being either the extension does not implement the correct interface and it just needs to be updated or a deeper technical issue that would cause issues when applied at the virtual host level?

When looking at the AWS Lambda filter, it states it explicitly supports per-filter configuration. I'm assuming that means it could apply at the route/virtual host level?

Also, I looked in the documentation but could not find it… Is there a way to get a list of extensions that are available per-filter config level?

Relevant Links:

• AWS Request Signing Filter
• AWS Request Signing Filter Source Code