PreferHTTPTransport tells the roundtripper constructor to prefer using an HTTP transport (as opposed to a dep2p stream transport).

ServerMustAuthenticatePeerID tells the roundtripper constructor that we MUST authenticate the Server's PeerID.

Host is a dep2p host for request/responses with HTTP semantics.

ProtocolMeta is metadata about a protocol.

WellKnownHandler is an http.Handler that serves the .well-known/dep2p resource.

PeerMetadataGetter lets RoundTrippers implement a specific way of caching a peer's protocol mapping.