//...
 services
 .AddApiVersioning(options =>
 {
 options.AssumeDefaultVersionWhenUnspecified = true;
 options.ReportApiVersions = true;
 // Default version
 var defaultVersion = Configuration.GetValue("RESTworld:Versioning:DefaultVersion", "*");
 if (defaultVersion == "*")
 {
 options.ApiVersionSelector = new LatestApiVersionSelector();
 }
 else
 {
 if (!ApiVersionParser.Default.TryParse(defaultVersion, out var parsedVersion) || parsedVersion is null)
 throw new ArgumentOutOfRangeException("RESTworld:Versioning:DefaultVersion", defaultVersion, "The setting for \"RESTworld:Versioning:DefaultVersion\" was neither \"*\" nor a valid API version.");
 options.DefaultApiVersion = parsedVersion;
 }
 // Version parameter
 var allowQueryStringVersioning = Configuration.GetValue("RESTworld:Versioning:AllowQueryParameterVersioning", false);
 if (allowQueryStringVersioning)
 {
 options.ApiVersionReader = ApiVersionReader.Combine(
 new MediaTypeApiVersionReader(versionParameterName),
 new QueryStringApiVersionReader(versionParameterName));
 }
 else
 {
 options.ApiVersionReader = new MediaTypeApiVersionReader(versionParameterName);
 }
 })
 .AddApiExplorer(options =>
 {
 options.GroupNameFormat = "'v'VVV";
 // Do not advertise versioning through query parameter as this is only intended for legacy clients and should not be visible as it is not considered RESTfull.
 if (options.ApiVersionParameterSource is not MediaTypeApiVersionReader)
 {
 options.ApiVersionParameterSource = new MediaTypeApiVersionReader(versionParameterName);
 }
 })
 .AddMvc();
//...

 public class LatestApiVersionSelector : IApiVersionSelector
 {
 /// <inheritdoc/>
 public ApiVersion SelectVersion(HttpRequest request, ApiVersionModel model)
 => model.ImplementedApiVersions.OrderByDescending(v => v).FirstOrDefault() ?? ApiVersion.Default ?? ApiVersion.Neutral;
 }

[ApiController]
[Produces("application/hal+json")]
[Route("")]
[ApiVersionNeutral]
public class HomeController : ControllerBase
{
 [HttpGet]
 [ProducesResponseType(typeof(Resource), StatusCodes.Status200OK)]
 public virtual IActionResult Index(ApiVersion version)
 {
 // ...
 }
}