Autofac dependency injection per request based on header parameter ASP.NET Core2.0

   builder.Register(c =>
            {
                string dependencyName= c.Resolve<IHttpContextAccessor>().HttpContext.Request.Headers[Constants.CountryHeader];
             
                return c.ResolveNamed<interface>(dependencyName);
            }).InstancePerLifetimeScope();

and in the module
   protected override void Load(ContainerBuilder builder)
        {
            //register modules here
            builder.RegisterType<ClassName>().Named<Interfacer>("Name of dependency");
}