if len(parts) == 1 {
			// this is an error on the server side
			parts = append(parts, "")
		}

		info := runtime.SerializerInfo{
			Serializer:       n.serializer,
			MediaType:        s,
			MediaTypeType:    parts[0],
			MediaTypeSubType: parts[1],
			EncodesAsText:    true,
		}

		for _, t := range n.streamTypes {
			if t == s {
				info.StreamSerializer = &runtime.StreamSerializerInfo{

			structuralSchemaGK:    kind.GroupKind(),
			preserveUnknownFields: crd.Spec.PreserveUnknownFields,
			supportedMediaTypes: []runtime.SerializerInfo{
				{
					MediaType:        "application/json",
					MediaTypeType:    "application",
					MediaTypeSubType: "json",
					EncodesAsText:    true,
					Serializer:       json.NewSerializer(json.DefaultMetaFactory, creator, typer, false),

	for _, s := range a.group.Serializer.SupportedMediaTypes() {
		if len(s.MediaTypeSubType) == 0 || len(s.MediaTypeType) == 0 {
			return nil, nil, fmt.Errorf("all serializers in the group Serializer must have MediaTypeType and MediaTypeSubType set: %s", s.MediaType)
		}
	}
	mediaTypes, streamMediaTypes := negotiation.MediaTypesForSerializer(a.group.Serializer)