jquery – Ajax获取返回ERR_SPDY_PROTOCOL_ERROR

这是我的Api：

[@R_489_10107@Get]
    public async Task<IActionResult> GetPackWithAllCards(int? packId)
    {
        if (packId == null)
        {
            return Json("An error has occured");
        }
        else
        {
            var pack = await _context.Packs
            .Include(p => p.TagPacks)
            .ThenInclude(tp => tp.Tag)
            .Include(p => p.CardPacks)
            .ThenInclude(cp => cp.Card)
            .ThenInclude(c => c.FaceCards)
            .ThenInclude(fc => fc.FacE)
            .ThenInclude(fc => fc.TemplatE)
            .Include(p => p.CardPacks)
            .ThenInclude(cp => cp.Card.FaceCards)
            .ThenInclude(fc => fc.Face.ImagE)
            .Include(p => p.CardPacks)
            .ThenInclude(cp => cp.Card.FaceCards)
            .ThenInclude(fc => fc.Face.sound)
            .SingLeorDefaultAsync(m => m.PackId == packId);
            if (pack == null)
            {
                return Json("An error has occured");
            }
            return Ok(pack);
        }
    }

和我的ajax电话：

$.get("/pack/GetPackWithAllCards",{ packId: pack.packId },function (pack) {
        alert(pack);
});

我的错误总是一样,我得到“无法加载资源：net :: ERR_SPDY_PROTOCOL_Error”状态= 0

我的api正确返回一个包但我的ajax调用没有得到它.