api version in url - asp net core 5 web api versioning

using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace AspNetCore5WebAPIVersioning.Controllers
{
    [Route("api/v{version:apiVersion}/[controller]")]
    [ApiController]
    [ApiVersion("1.0")]
    [ApiVersion("1.1")]
    public class BookController : ControllerBase
    {
        [HttpGet]
        public string Get()
        {
            return "This string is for testing";
        }
    }
}