Companion

How long connect waits for a peer to answer on a new connection: well over the second a forward waits, as a node's first connection to a peer that has just started pays for the h2c upgrade and the peer's warm-up.

The default of the forwards open to one peer at a time: the peer's InternalHttp.MAX_CONCURRENT_STREAMS less the HttpSignalSender.DEFAULT_CONCURRENCY the node's signal sender takes on the same connection.