assertLockNotHeld()

    val nowNs = System.nanoTime()

    if (rawSocket.isClosed ||
      javaNetSocket.isClosed ||
      javaNetSocket.isInputShutdown ||
      javaNetSocket.isOutputShutdown
    ) {
      return false
    }

    val http2Connection = this.http2Connection
    if (http2Connection != null) {
      return http2Connection.isHealthy(nowNs)
    }