exchange: Exchange,
    requestDone: Boolean,
    responseDone: Boolean,
    e: E,
  ): E {
    if (exchange != this.exchange) return e // This exchange was detached violently!

    var bothStreamsDone = false
    var callDone = false
    this.withLock {
      if (requestDone && requestBodyOpen || responseDone && responseBodyOpen) {
        if (requestDone) requestBodyOpen = false