) {
          try {
            // Wait for the server to send the duplex response before acting on the 301 response
            // and resetting the stream.
            duplexResponseSent.await()
          } catch (e: InterruptedException) {
            throw AssertionError()
          }
          super.responseHeadersEnd(call, response)
        }
      }
    client =
      client.newBuilder()