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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using System.Net.Http.Json;
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using System.Net;
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using Newtonsoft.Json;
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using Microsoft.AspNetCore.Mvc;
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using System.Text.Json;
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using System.Security.Authentication.ExtendedProtection;
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using Newtonsoft.Json.Linq;
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using System.Text.Json.Serialization.Metadata;
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namespace HttpClientStudy.UnitTest.HttpClients
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{
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/// <summary>
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/// HttpClient 常见问题测试
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/// </summary>
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public class HttpClientQuestTest
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{
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private readonly ITestOutputHelper _logger;
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public HttpClientQuestTest(ITestOutputHelper outputHelper)
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{
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_logger = outputHelper;
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}
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/// <summary>
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/// 多HttpClient实例问题
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/// 1、HttpClient虽然继承了 IDisposable 接口，但它是可以被共享的，且线程安全。Using使用并不能立即释放
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/// 2、网络特性：虽然HttpClient客户端断开，但Web服务并不知道，连接依然存在，状态为 “ TIME_WAIT”(继续等待看是否还有延迟的包会传输过来。)
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/// Windows默认为 240s
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/// 引发常见问题：
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/// 1、HttpClient 多实例并存，有很大资源消耗；
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/// 2、在高并发的情况下，连接来不及释放， socket 被耗尽: 程序异常
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/// 3、连带着会出现“各种套接字问题”
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///
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/// 查看问题：
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/// 程序并发或多次请求后，通过 netstate 查看下 TCP 连接情况：有很多 TIME_WAIT 状态连接；很可能程序异常；
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///
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/// 解决：
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/// 1、复用HttpClient
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/// 2、HttpClientFactory
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/// 3、解决DNS问题可以给HttpClient传参：SocketsHttpHandler
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/// </summary>
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/// <returns></returns>
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[Fact]
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public async Task Multi_ClientObject_Test()
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{
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for (int i = 0; i < 100; i++)
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{
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HttpClient httpClient = new HttpClient();
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var responseMessage = await httpClient.GetAsync(TestConfig.WebApiBaseUrl + "/api/account/ping");
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responseMessage.EnsureSuccessStatusCode();
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}
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}
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[Fact]
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public async Task Multi_ClientObject2_Test()
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{
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HttpClient httpClient = new HttpClient()
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{
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BaseAddress = new Uri(TestConfig.WebApiBaseUrl)
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};
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for (int i = 0; i < 100; i++)
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{
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var responseMessage = await httpClient.GetAsync("/api/account/ping");
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responseMessage.EnsureSuccessStatusCode();
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}
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}
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}
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}
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