Ajax Get return ERR_SPDY_PROTOCOL_ERROR

user_6043786 0
Viewed 3603

I'm working on a webapp in AspNetCore and i'm trying to get data from my controller by an ajax call.

Here is my Api: 

[HttpGet]
    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);
        }
    }

and my ajax call: 

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

My error is allways the same, i get "Failed to load resource: net::ERR_SPDY_PROTOCOL_ERROR" with status = 0

My api return correctly a pack but my ajax call don't get it.

asp.net-core jquery ajax
4 Answers

I just ran into this error. The reason was a serialization error to JSON.

Check if your Packs class and child classes have accessors which could create an Object reference not set to an instance exception if all child classes are not populated.

Example:

public class SaveStatus
{
  public bool Success
  {
    get
    {
      return ValidationErrors.Count == 0;
    }
  }
  public List<ValidationError> ValidationErrors { get; set; }
}

In this case if the list ValidationErrors is not populated then JSON will not be able to serialize the Success accessor triggering the error in question.

user_18310650
user_12458970

In my case it was Json reference loop handling: Adding the following fixed it:

services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1)
        .AddJsonOptions(o => 
            o.SerializerSettings.ReferenceLoopHandling = ReferenceLoopHandling.Ignore);
user_59148070
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