本文章介绍在 ASP.NET Core 中使用 HttpClient 发起 Http 请求
由于实例化 HttpClient 类将耗尽重负载下可用的插槽数，会导致 SocketException 错误
所以使用最佳实践 IHttpClientFactory 创建 HttpClient
先决条件
.NET 8 SDK
正确使用 HttpClient 的示例
在使用 HttpClient 时应该使用单例模式
public class GoodController : ApiController { private static readonly HttpClient HttpClient;
static GoodController() { HttpClient = new HttpClient(); } }
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使用 IHttpClientFactory 实现
首先需要在代码中引入 HttpClientFactory
基本使用
// 在容器中注册服务 services.AddHttpClient();
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使用构造函数注入使用 IHttpClientFactory
IHttpClientFactory _httpClientFactory; public HomeController(IHttpClientFactory httpClientFactory) { _httpClientFactory = httpClientFactory; } [HttpGet] public async void Get() { var request = new HttpRequestMessage(HttpMethod.Get, "http://localhost:5000/Home/Index"); var client = _httpClientFactory.CreateClient(); var response = await client.SendAsync(request); var httpContent = response.Content; var result = await httpContent.ReadAsStringAsync(); }
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命名不同的配置
// 在容器中注册服务 services.AddHttpClient(); services.AddHttpClient("local", c => { c.BaseAddress = new Uri("http://localhost:5000"); c.DefaultRequestHeaders.Add("Accept", "application/json"); });
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使用构造函数注入使用 IHttpClientFactory
IHttpClientFactory _httpClientFactory; public HomeController(IHttpClientFactory httpClientFactory) { _httpClientFactory = httpClientFactory; } [HttpGet] public async void Get() { var client = _httpClientFactory.CreateClient("local"); var response = await client.GetAsync("Home/Index"); HttpContent httpContent = response.Content; var result = await httpContent.ReadAsStringAsync(); }
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参考文档
Docs.Microsoft - HttpClient Class
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