說明：本篇不是說明HttpClient怎么使用，而以分享在asp.net core mini api框架下，HttpClient的引入和使用方式。

我們在業務開發中，免不了調用三方的服務，這時就會用到HttpClient，在早期的asp.net core框架中，一般是通過new HttpClient來實現對三方的請求，現在，可以通過HttPClientFactory來實現，這樣的好處是可以池化連接，節省資源。

基礎使用方法很簡單：

var builder = WebApplication.CreateBuilder(args);builder.Services.AddHttpClient();var app = builder.Build();app.MapGet("/test", async (IHttpClientFactory clientFactory) =>{var client = clientFactory.CreateClient();var content = await client.GetStringAsync("https://www.google.com");});app.Run();

當項目中有多個三方服務請求，為了區分各個三方服務，可以采用命名方式

var builder = WebApplication.CreateBuilder(args);builder.Services.AddHttpClient("Google", httpClient => {httpClient.BaseAddress = new Uri("https://www.google.com/"); }); builder.Services.AddHttpClient("BaiDu", httpClient => {httpClient.BaseAddress = new Uri("https://www.baidu.com/"); }); var app = builder.Build();app.MapGet("/testgoogle", async (IHttpClientFactory clientFactory) =>{var?googleClient?=?clientFactory.CreateClient("Google");return?await?googleCclient.GetStringAsync("search?q=桂素偉");}); app.MapGet("/testbaidu", async (IHttpClientFactory clientFactory) => {var?baiduClient?=?clientFactory.CreateClient("BaiDu");return?await?lient?.GetStringAsync("s?wd=桂素偉"); }); app.Run();

還可以項目中每個服務的請求各自封裝，各用各的HttpClient:

var builder = WebApplication.CreateBuilder(args);builder.Services.AddHttpClient<IGoogleService, GoogleService>(); builder.Services.AddHttpClient<IBaiDuService, BaiDuService>(httpClient => {httpClient.BaseAddress = new Uri("https://www.baidu.com/"); });var app = builder.Build();app.MapGet("/testgoogle", async (IGoogleService google) =>{return await google.GetContentAsync();}); app.MapGet("/testbaidu", async (IBaiDuService baidu) => {return await baidu.GetContentAsync(); }); app.Run();interface IGoogleService {Task<string> GetContentAsync(); } class GoogleService : IGoogleService {private readonly HttpClient _httpClient;public GoogleService(HttpClient httpClient){_httpClient = httpClient;_httpClient.BaseAddress = new Uri("https://www.google.com/");}public async Task<string> GetContentAsync(){return await _httpClient.GetStringAsync("search?q=桂素偉");} } interface IBaiDuService {Task<string> GetContentAsync(); } class BaiDuService : IBaiDuService {private readonly HttpClient _httpClient;public BaiDuService(HttpClient httpClient){_httpClient = httpClient;}public async Task<string> GetContentAsync(){return await _httpClient.GetStringAsync("s?wd=桂素偉");} }

總結

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