private async Task GetModel(HttpContext httpContext)
 {
     var    dbContext = httpContext.RequestServices.GetService(_options.DbContextType) as DbContext;
     var    converter = new DtoConverter();
     var    dto       = converter.ConvertToDto(dbContext.Model);
     string json      = JsonConvert.SerializeObject(dto, new JsonSerializerSettings {
         ContractResolver = new CamelCasePropertyNamesContractResolver()
     });
     await httpContext.Response.WriteAsync(json);
 }