GatewayError translates underlying blockstore error into one that gateway code will return as HTTP 502 or 504 it also makes sure Retry-After hint from remote blockstore will be passed to HTTP client, if present.

WithNameSystem sets the name system to use for the gateway.

WithPrometheusRegistry sets the registry to use for metrics collection.

WithValueStore sets the ValueStore to use for the gateway.

type DataCallback = func(resource string, reader io.Reader) error TODO: Don't use a caboose type, perhaps ask them to use a type alias instead of a type.

TODO: Don't use a caboose type.