MVC Web API Angular应用程序('http://localhost:4200'已被CORS策略阻止）

Question

<httpProtocol>
  <customHeaders>
    <add name="Access-Control-Allow-Origin" value="http://localhost:4200" />
    <add name="Access-Control-Allow-Headers" value="*" />
    <add name="Access-Control-Allow-Methods" value="*" />
    <add name="Content-Type" value="application/json"/>

    <add name="Access-Control-Allow-Credentials" value="true" />
  </customHeaders>
</httpProtocol>

 [EnableCors(origins: "http://localhost:4200", headers: "*", methods: "*")]

    [HttpPost]
    [AllowAnonymous]
    [DisableCors]
    public JsonResult SignUp(HF_Accnt_Access Company)

Answer 1

    public static void Register(HttpConfiguration config)
    {
        var cors = new EnableCorsAttribute(origins: "*", headers: "*", methods: "*");
        config.EnableCors(cors);
        
        // Web API configuration and services

        // Web API routes
        config.MapHttpAttributeRoutes();

        config.Routes.MapHttpRoute(
            name: "DefaultApi",
            routeTemplate: "api/{controller}/{id}",
            defaults: new { id = RouteParameter.Optional }
        );
    }