val level = this.level

      val request = chain.request()
      if (level == Level.NONE) {
        return chain.proceed(request)
      }

      val logBody = level == Level.BODY
      val logHeaders = logBody || level == Level.HEADERS

      val requestBody = request.body

      val connection = chain.connection()
      var requestStartMessage =

The application-layer can also do blocking reads. If the application asks to read and there's nothing available, we need to hold that thread until either the bytes arrive, the stream is closed, or a timeout elapses. If we get bytes but there's nobody asking for them, we buffer them. We don't consider bytes as delivered for flow control until they're consumed by the application.

        socket.shutdownOutput()
        return false
      }
      if (response.socketPolicy === NoResponse) {
        // This read should block until the socket is closed. (Because nobody is writing.)
        if (source.exhausted()) return false
        throw ProtocolException("unexpected data")
      }

      var reuseSocket = true
      val requestWantsWebSockets =