### `wai http origin`: a refusal ends cleanly

- The origin answered 503 and closed with the request unread, so the connection ended in a reset
  after the answer, and a client reading to the close saw an error despite a valid 503. For a client
  past `--max-per-peer` or `--max-connections`, the origin now stops sending and reads a little more
  before closing, as it already did for a 431.
