RestTemplate如何通过HTTP Basic Auth认证示例说明

@SpringBootTest
class BasicAuthTests {
   @Resource
   private RestTemplate restTemplate;
   @Test
   void testBasicAuth() {
      //该url上携带用户名密码是httpbin网站测试接口的要求，
     //真实的业务是不需要在url上体现basic auth用户名密码的
      String url = "http://www.httpbin.org/basic-auth/admin/adminpwd";
      //在请求头信息中携带Basic认证信息(这里才是实际Basic认证传递用户名密码的方式)
      HttpHeaders headers = new HttpHeaders();
      headers.set("authorization",
                  "Basic " +
                  Base64.getEncoder()  
                       .encodeToString("admin:adminpwd".getBytes()));
     //发送请求
      HttpEntity<String> ans = restTemplate
                  .exchange(url,
                        HttpMethod.GET,   //GET请求
                        new HttpEntity<>(null, headers),   //加入headers
                        String.class);  //body响应数据接收类型
      System.out.println(ans);
   }

}

@Configuration
public class ContextConfig {
    @Bean("OKHttp3")
    public RestTemplate OKHttp3RestTemplate(){
        RestTemplate restTemplate = new RestTemplate(getClientHttpRequestFactory());
        //添加拦截器
        restTemplate.getInterceptors().add(getCustomInterceptor());
        return restTemplate;
    }
   //实现一个拦截器：使用拦截器为每一个HTTP请求添加Basic Auth认证用户名密码信息
    private ClientHttpRequestInterceptor getCustomInterceptor(){
        ClientHttpRequestInterceptor interceptor = (httpRequest, bytes, execution) -> {
            httpRequest.getHeaders().set("authorization",
                    "Basic " +
                            Base64.getEncoder()
                                    .encodeToString("admin:adminpwd".getBytes()));
            return execution.execute(httpRequest, bytes);
        };
        return interceptor;
    }
    //这段代码是《第3节-底层HTTP客户端实现切换》的内容
    private ClientHttpRequestFactory getClientHttpRequestFactory() {
        int timeout = 100000;
        OkHttp3ClientHttpRequestFactory clientHttpRequestFactory
                = new OkHttp3ClientHttpRequestFactory();
        clientHttpRequestFactory.setConnectTimeout(timeout);
        return clientHttpRequestFactory;
    }
}