server.enqueue(MockResponse(body = "abc"))

    val client =
      client.newBuilder()
        .retryOnConnectionFailure(false)
        .build()

    // Seed the connection pool so we have something that can fail.
    val request1 = Request.Builder().url(server.url("/")).build()
    val response1 = client.newCall(request1).execute()
    assertThat(response1.body.string()).isEqualTo("abc")

    // The URL will remain available if hasNext() returned true...
    val i = cache.urls()
    assertThat(i.hasNext()).isTrue()

    // ...so even when we evict the element, we still get something back.
    cache.evictAll()
    assertThat(i.next()).isEqualTo(url.toString())

    // Remove does nothing. But most importantly, it doesn't throw!
    i.remove()
  }

  @Test

    server.enqueue(MockResponse(socketPolicy = SocketPolicy.DisconnectAfterRequest))
    server.enqueue(MockResponse(body = "def"))

    // Seed the connection pool so we have something that can fail.
    assertContent("abc", getResponse(newRequest("/")))
    val post =
      getResponse(
        Request(
          url = server.url("/"),
          body = "body!".toRequestBody(null),

### Bug or Regression

- Currently, NodeAdded QueueingHint could not always be called because of the internal feature called preCheck.
  It's definitely not something expected for plugin developers,
  and we're trying to eventually remove preCheck completely to fix this.
  Until then we'll register UpdateNodeTaint event for plugins that have NodeAdded event, but don't have UpdateNodeTaint event.