client.newCall(request).enqueue(callback)
    callback.await(server.url("/0")).assertFailure("Too many follow-up requests: 21")
  }

  @Test
  fun http204WithBodyDisallowed() {
    server.enqueue(
      MockResponse(
        code = 204,
        body = "I'm not even supposed to be here today.",
      ),
    )
    executeSynchronously("/")