在应用程序服务调用第三方 API 中部署的 ASP.NET Core 5.0 Web API 间歇性失败并引发 500（内部服务器错误）

Question

ASP.NET核心Web API呼叫第三党API间歇性失败。

与Postman的负载测试时，以下例外会间歇性地提高。 “与状态代码500（内部服务器错误）的呼叫失败：post https://sample.com/apiendpoint。”

我尝试使用httpclient/ihttpclientFactory方法的命名/键入，问题仍在继续。

如何确保它使用连接池而不是在一个上创建新的。 Sethandlerlifetime将连接保持在池中以供将来使用的通话的正确价值。

    services.AddHttpClient<IRestService, RestServiceOne>()
    .SetHandlerLifetime(TimeSpan.FromMinutes(5))  //Set lifetime to five minutes
    .AddPolicyHandler(GetRetryPolicy());

以下代码在RESTSERVICEONE.CS中，

   public class RestServiceOne : IRestService
    {
        private readonly IHttpClientFactory _httpClientFactory;
        public RestServiceOne(IHttpClientFactory httpClientFactory)
        {
            _httpClientFactory = httpClientFactory;
        }
        public async Task<HttpResponseMessage> GetDataAsync(string destinationUrl, string user,
            string password, string requestXml, string orderNumber, CancellationToken cancellationToken)
        {
            var endpoint = $"{destinationUrl}";
            var authToken = Encoding.ASCII.GetBytes($"{user}:{password}");
            var data = new StringContent(requestXml, Encoding.UTF8, "text/xml");
            var httpRequestMessage = new HttpRequestMessage(
                HttpMethod.Post,
                endpoint)
            {
                Headers =
            {
                { "Accept", "application/vnd.github.v3+json" },
                { "User-Agent", "HttpRequestsConsoleSample" }
            }
            };
            httpRequestMessage.Content = data;
            var httpClient = _httpClientFactory.CreateClient();

            httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic",
                    Convert.ToBase64String(authToken));
            var httpResponseMessage = await httpClient.SendAsync(httpRequestMessage);
            return httpResponseMessage;

        }
    }

我还尝试了Microsoft Type示例中给出的HTTPCLIENT注入。

public class RestService 
{
    private readonly HttpClient _httpClient;
    public RestService(HttpClient httpClient)
    {
        _httpClient = httpClient;
        try
        {
            _httpClient.BaseAddress = new Uri("https://testxx.com/test");
            // GitHub API versioning
            _httpClient.DefaultRequestHeaders.Add("Accept",
                "application/vnd.github.v3+json");
            // GitHub requires a user-agent
            _httpClient.DefaultRequestHeaders.Add("User-Agent",
                "HttpClientFactory-Sample");
        }
        catch(Exception ex)
        {

        }
    }

    public async Task<HttpResponseMessage> GetDataAsync(string destinationUrl, string user,
        string password, string requestXml, string orderNumber, CancellationToken cancellationToken)
    {
        var endpoint = $"{destinationUrl}";
        var authToken = Encoding.ASCII.GetBytes($"{user}:{password}");
        _httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic",
                Convert.ToBase64String(authToken));
        var data = new StringContent(requestXml, Encoding.UTF8, "text/xml");
        try
        {
            var response = await _httpClient.PostAsync(endpoint, data);
            return response;
        }
        catch(Exception ex)
        {
            throw;
        }
    }
}

我直接在服务层中尝试了

var endpoint = $"{destinationUrl}";
var authToken = Encoding.ASCII.GetBytes($"{user}:{password}");
var data = new StringContent(requestXml, Encoding.UTF8, "text/xml");
try
{

var response = await endpoint
    .WithHeader("Content-Type", "text/xml")
    .WithHeader("app-bu-id", "SANIDERMMEDICAL")
    .WithHeader("Authorization", new AuthenticationHeaderValue("Basic", Convert.ToBase64String(authToken)))
    .PostAsync(data);

上述3种方法失败。

.sethandlerlifetime（）将连接保持在池中并避免创建新的。

我使用以下方法看到了其他一些示例，但是如何将其与ihttpclient -factory / flurl一起使用。

var socketsHandler = new SocketsHttpHandler
{
    PooledConnectionLifetime = TimeSpan.FromMinutes(10),
    PooledConnectionIdleTimeout = TimeSpan.FromMinutes(5),
    MaxConnectionsPerServer = 10
};

var client = new HttpClient(socketsHandler);

从Azure调用第三方API时，我如何确保它使用连接池并避免500错误。

Answer 1

当我使用httpclient时，我找到了解决方案。

    private static readonly HttpClient httpClient = new HttpClient(new SocketsHttpHandler
    {
        PooledConnectionLifetime = TimeSpan.FromSeconds(60),
        PooledConnectionIdleTimeout = TimeSpan.FromSeconds(20),
        MaxConnectionsPerServer = 10
    });

这篇文章帮助我

尝试了几个值但最终选择此问题，因为没有错误。