When the STAC Auth Proxy initializes, we should test the upstream STAC API for compliance with required conformances: * [Filter Extension](https://github.com/stac-api-extensions/filter/blob/main/README.md) * [Item Search](https://github.com/radiantearth/stac-api-spec/tree/release/v1.0.0/item-search#endpoints) * [Collection Search](https://github.com/stac-api-extensions/collection-search) Additional, consider somehow comparing filtered properties to [queryables response](https://github.com/stac-api-extensions/filter?tab=readme-ov-file#queryables).