ASP.NET MVC Core - 通过 HttpClient 使用 API

我有一个包含两个项目的 Visual Studio 解决方案；API 和 MVC。MVC 是包含我的视图等的 MVC 项目，API 是包含 API 端点和逻辑的 API 项目。由于我有两个项目，我已将我的解决方案配置为具有多个启动项目。

客户端

public const string AuctionAPI = "http://localhost:44337/";
public const string AuctionClient = "http://localhost:44398/";

public static HttpClient GetClient()
{
    HttpClient client = new HttpClient();
    client.BaseAddress = new Uri(AuctionAPI);
    client.DefaultRequestHeaders.Accept.Clear();
    client.DefaultRequestHeaders.Accept.Add(new System.Net.Http.Headers.MediaTypeWithQualityHeaderValue("application/json"));
    return client;
}

MVC 控制器（注意：我在第 6 行收到错误，当我设置 HttpResponseMessage 并尝试调用 client.GetAsync()

[Route("item/{itemNumber}")]
public async Task<IActionResult> IndexForItem(int itemNumber)
{
    var client = GetClient();
    //ERROR: In next line, HttpResponseMessage it tries to call my API controller and fails
    HttpResponseMessage response = await client.GetAsync($@"api/Auction/SeeOneItem/{itemNumber}");

    if (response.IsSuccessStatusCode)
    {
        string content = await response.Content.ReadAsStringAsync();
        var model = await response.Content.ReadAsAsync<AuctionItemProxy>();

        return View(model);
    }
    else
    {
        return Content("An error occured.");
    }
}

API 控制器（注意：我在此方法中的断点从未命中）

[HttpGet("SeeOneItem/{itemNumber:int}")]
public AuctionItem GetAuctionItem(int itemNumber)
{
    var item = _auctionItemDataFactory.AuctionItems.First(x => x.ItemNumber == itemNumber);
    if (item == null)
    {
        return null;
    }
    return _auctionItemDataFactory.AuctionItems.First(x => x.ItemNumber == itemNumber);
}

我收到的实际错误

IOException: Unable to read data from the transport connection