crea un Hub de signal R en una azure function

using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Extensions.Http;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Logging;
using Microsoft.Azure.WebJobs.Extensions.SignalRService;

namespace Azure.Functions
{
    public static class Function1
    {
        [FunctionName("negotiate")]
        public static SignalRConnectionInfo GetSignalRInfo(
            [HttpTrigger(AuthorizationLevel.Anonymous, "post")] HttpRequest req,
            [SignalRConnectionInfo(HubName = "chat")] SignalRConnectionInfo connectionInfo)
        {
            return connectionInfo;
        }
    }
}