如何使用visual studio WebAPI项目将外部API +凭据路由到我的本地主机URL？

public static void Register(HttpConfiguration config)
{
    // 允许跨域资源共享
    config.EnableCors();

    // 添加外部API路由
    config.Routes.MapHttpRoute(
        name: "ExternalApi",
        routeTemplate: "api/external/{controller}/{action}/{id}",
        defaults: new { id = RouteParameter.Optional }
    );
}

using System.Net.Http;
using System.Web.Http;

namespace YourProject.Controllers
{
    public class ExternalApiController : ApiController
    {
        private HttpClient _httpClient;

        public ExternalApiController()
        {
            _httpClient = new HttpClient();
        }

        [HttpGet]
        public IHttpActionResult GetExternalData()
        {
            // 使用HttpClient发送外部API请求
            // 这里可以根据需要进行身份验证和添加凭据

            string apiUrl = "外部API的URL";
            HttpResponseMessage response = _httpClient.GetAsync(apiUrl).Result;
            response.EnsureSuccessStatusCode();

            string result = response.Content.ReadAsStringAsync().Result;

            return Ok(result);
        }
    }
}