创建一个名为HttpClientTest的Web API项目
新建Clients文件夹，用于存放自定义的HttpClient
在Clients下新建一个MyHttpClient类
代码为：
namespace HttpClientTest.Clients
{
public class MyHttpClient
{
private readonly HttpClient _client;
public MyHttpClient(HttpClient client)
{
_client = client;
}
public async Task<string> ShowAsync()
{
return await _client.GetStringAsync("https://www.baidu.com");
}
}
}
将自定义的MyHttpClient服务注册进容器中
services.AddHttpClient<MyHttpClient>();
新建一个TestController来对我们的MyHttpClient做一个测试
using HttpClientTest.Clients;
using Microsoft.AspNetCore.Mvc;
namespace HttpClientTest.Controllers
{
[ApiController]
[Route("[controller]/[action]")]
public class TestController : ControllerBase
{
private readonly MyHttpClient _myHttpClient;
public TestController(MyHttpClient myHttpClient)
{
_myHttpClient = myHttpClient;
}
[HttpGet]
public async Task<object> GetAsync()
{
return await _myHttpClient.ShowAsync();
}
}
}
访问GetAsync接口，发现成功返回了百度首页的html内容
很多时候，我们希望通过相对路径的方式来对远程服务进行访问
可以把MyHttpClient改为：
namespace HttpClientTest.Clients
{
public class MyHttpClient
{
private readonly HttpClient _client;
public MyHttpClient(HttpClient client)
{
_client = client;
}
public async Task<string> ShowAsync()
{
//return await _client.GetStringAsync("https://www.baidu.com");
return await _client.GetStringAsync("/");
}
}
}
在注册服务时就要配置基地址
services.AddHttpClient<MyHttpClient>(client =>
{
client.BaseAddress = new Uri("https://www.baidu.com");
});
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