Question

我遇到了使用我的代码从API获取响应的问题，请求没有超时，它根本没有给我回复。我在我自己的API中创建了一个api端点，以返回json字符串，然后使用＆＃34; Firefox Poster＆＃34;手动发布json数据。它工作得很好。有了这个，我相信问题就在我的代码中。

我得到了一个C＃WebAPI，我正在开发它与Angular前端一起使用（这是有效的，它只适用于历史）。在调用我的API时，我创建了对象＆＃34; EnrollmentRequestDto＆＃34;

public class EnrollmentRequestDto
{
    /// <summary>
    /// Context Information for the request. Contains the Ship-To, language code and timezone.
    /// </summary>
    [JsonProperty("requestContext")]
    public RequestContextDto RequestContext { get; set; }
    /// <summary>
    /// Unique ID provided by DEP to reseller on provisioning DEP access. This would be the reseller's DEP ID if its posted by distributor OBO a reseller, and would be his own depResellerId if a reseller is posting for self.
    /// </summary>
    [JsonProperty("depResellerId")]
    public string DepResellerId { get; set; }
    /// <summary>
    /// Unique transaction ID provided by the reseller
    /// </summary>
    [JsonProperty("transactionId")]
    public string TransactionId { get; set; }
    /// <summary>
    /// List of orders in the transaction (limit 1000 per transaction)
    /// </summary>
    [JsonProperty("orders")]
    public List<OrderDto> Orders { get; set; }
}

创建此对象后，我发送到我的类RequestHandler和方法BulkEnrollRequest，其中atm是用HttpClient扩展名Flurl编写的，可以在这里找到：github

public IResponse BulkEnrollRequest(EnrollmentRequestDto enrollmentRequest)
    {
        try
        {
            var result = _bulkEnrollUrl.PostJsonAsync(enrollmentRequest).ReceiveJson<SuccessResponse>();
            result.Wait();
            return result.Result;
        }
        catch (FlurlHttpTimeoutException)
        {
            throw new AppleTimeOutException();
        }
        catch (FlurlHttpException ex)
        {
            return _errorHandler.DeserializeFlurlException(ex);
        }
    }

我也试过这个以确保在Flurl中没有任何反应（这只是为了调试到我想要得到响应的地方）：

public async Task<IResponse> BulkEnrollRequest(EnrollmentRequestDto enrollmentRequest)
    {
        var json = JsonConvert.SerializeObject(enrollmentRequest);

        var httpClient = new HttpClient();
        httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
        HttpResponseMessage response = await httpClient.PostAsync(_bulkEnrollUrl, new StringContent(json, Encoding.UTF8, "application/json"));

        return new SuccessResponse();
    }

代码在等待点冻结，没有任何事情发生。我试图在BulkEnrollRequest之后放置一个断点，所以它永远不会离开这个方法。

现在这里有趣的部分：它在我使用ErrorHandler时工作，并且在某些时候API刚刚停止响应。 Wireshark显示正在提出请求......所以我被困住了。

感谢任何帮助。

修改

这现在有效！我从API控制器到RequestHandler一直实现了 async ，然后等待每次调用。供参考：

public async Task<IResponse> BulkEnrollRequest(EnrollmentRequestDto enrollmentRequest)
    {
        try
        {
            var result = await _bulkEnrollUrl.PostJsonAsync(enrollmentRequest).ReceiveJson<SuccessResponse>();
            return result;
        }
        catch (FlurlHttpTimeoutException)
        {
            throw new AppleTimeOutException();
        }
        catch (FlurlHttpException ex)
        {
            return _errorHandler.DeserializeFlurlException(ex);
        }
    }

Answer 1

现在已修复。我相信Wireshark流量看起来如此奇怪的原因是由于代码中的死锁，并且超时在我身边，这意味着我永远无法确认信息。为了解决这个问题，我在所有方法上实现了 async ，从Controller到我的RequestHandler类。供参考：

public async Task<IResponse> BulkEnrollRequest(EnrollmentRequestDto enrollmentRequest)
    {
        try
        {
            var result = await _bulkEnrollUrl.PostJsonAsync(enrollmentRequest).ReceiveJson<SuccessResponse>();
            return result;
        }
        catch (FlurlHttpTimeoutException)
        {
            throw new AppleTimeOutException();
        }
        catch (FlurlHttpException ex)
        {
            return _errorHandler.DeserializeFlurlException(ex);
        }
    }

Answer 2

试试此代码

安装包Microsoft.AspNet.WebApi.Client

 using (var client = new HttpClient())
        {
            client.BaseAddress = new Uri("http://localhost:9000/");
            client.DefaultRequestHeaders.Accept.Clear();
            client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

            HttpResponseMessage response = await client.PostAsJsonAsync("api/products", enrollmentRequest);
            if (response.IsSuccessStatusCode)
            {
                var result = await response.Content.ReadAsAsync<T>();
            }
        }

C＃Flurl和HttpClient，REST API没有响应

2 个答案: