asp.net core override Cache-Control header

app.UseStaticFiles(new StaticFileOptions()
{
    ServeUnknownFileTypes = true,
    OnPrepareResponse = context =>
    {
        context.Context.Response.Headers["test"] = "ok"; // this work
        context.Context.Response.Headers[HeaderNames.CacheControl] = "public, max-age=1296000, must-revalidate"; // doesn't work => always respond "no-store, must-revalidate, no-cache"
    },

});