fun connectionReuse(
    protocol: Protocol,
    mockWebServer: MockWebServer,
  ) {
    setUp(protocol, mockWebServer)
    server.enqueue(MockResponse(body = "ABCDEF"))
    server.enqueue(MockResponse(body = "GHIJKL"))
    val call1 = client.newCall(Request(server.url("/r1")))
    val call2 = client.newCall(Request(server.url("/r1")))
    val response1 = call1.execute()
    val response2 = call2.execute()