C# Azure.NET Core Appservice由于异步调用而锁定发送502.3

我在Azure应用程序服务中运行的.NET Core 2.X应用程序中运行了此方法。我有一个远程服务器，我们使用这种方法从我们网站上的按钮按钮调用。这就叫远程设备

角度按钮-->Azure中的.NET核心应用程序服务-->另一个应用程序服务-->internet\cell连接设备。我们等待设备的响应返回状态码

如果我快速向这个方法发送命令[2或3秒]，它会导致应用程序服务停止响应，直到我重新启动它。我阅读了本文并添加了

[，HttpCompletionOption.ResponseHeadersRead）.ConfigureAwait（false）]

但是，我仍然可以冻结整个应用程序，并要求重新启动，以快速向该方法发送命令

private async void SetEndPointValueAsync(string stunnelUrl, string username, string password)
{
            try
            {
                //set the user name and password
                var httpClientHandler = new HttpClientHandler()
                {
                    Credentials = new NetworkCredential(username, password)
                };
                using (var client = new HttpClient(httpClientHandler))
                {
                    using (var response = await client.GetAsync(stunnelUrl**, HttpCompletionOption.ResponseHeadersRead).ConfigureAwait(false)**)
                    {
                        if (response.IsSuccessStatusCode)
                        {
                            LogInfo(typeof(IntegrationService), stunnelUrl, LogAction.EndpointUpdate);
                        }
                        else
                        {
                            //request failed.
                            LogWarning(typeof(IntegrationService), stunnelUrl, LogAction.DeviceRequest);
                        }
                        //using (var content = response.Content)
                        //{
                        //    //do here your changes when required
                        //}
                    }
                }
            }
            catch (Exception e)
            {
                LogErrorDetailed(e, typeof(IntegrationService), stunnelUrl, LogAction.DeviceRequest);
            }
}

---

通常，您不想创建太多的

HttpClient

实例，因为这样会失去它提供的许多管理好处

您可以通过只使用一个实例来减少一些开销，就像这样

private readonly HttpClient _client;

public ClassConstructor(HttpClient client)
{
    _client = client ?? new HttpClient();       
}

然后你可以改变你的方法，让它看起来像这样

private async Task SetEndPointValueAsync(Uri stunnelUri, string username, string password)
{
    if (stunnelUri == null) throw new ArgumentNullException(nameof(stunnelUri));
    if (String.IsNullOrEmpty(username)) throw new ArgumentNullException(nameof(username));
    if (String.IsNullOrEmpty(password)) throw new ArgumentNullException(nameof(password));

    byte[] byteArray = Encoding.ASCII.GetBytes($"{username}:{password}");
    string scheme = "Basic";
    string parameter = Convert.ToBase64String(byteArray);

    HttpRequestMessage request = new HttpRequestMessage();
    request.Method = HttpMethod.Post;
    request.RequestUri = stunnelUri;
    request.Headers.Authorization = new AuthenticationHeaderValue(scheme, parameter);
    try
    {
        HttpResponseMessage response = await _client.SendAsync(request);

        // This will throw an HttpRequestException if there is a failure above
        response.EnsureSuccessStatusCode();

        // do your stuff here...
        // { ... }

    }
    catch (HttpRequestException)
    {
        // { log your connection / bad request issue. }
    }
    catch (Exception) 
    {
        // I don't recommend this, but since you had it...
        // { handle all other exceptions }
    }
}

---

async void

始终是一个红色标志，除非它是一个事件处理程序。您不返回任务的原因是什么？你怎么称呼这个方法？我们能看到那个密码吗？