Blazor, call Server Side Controller from .razor page

Question

I'm using Blazor, the last preview:

 

On razor page, I'm trying using:

 

await Http.PostJsonAsync("api/ValuesController", addItem);

 

This is my Controller:

 

[Route("api/Controller")]

public class ValuesController : Controller

// POST api/<controller>

[HttpPost]

public void Post([FromBody]WeatherForecast value)

{

value.MyMethod();

I'm registering on server:

app.UseEndpoints(endpoints =>

{

endpoints.MapDefaultControllerRoute();

endpoints.MapFallbackToClientSideBlazor<Client.Program>("index.html");

endpoints.MapControllerRoute(name: "DefaultApi", pattern: "api/{controller}");

});

}

 

But here is occurring error 404: await Http.PostJsonAsync("api/ValuesController", addItem);

 

What Am I missing?