cockClient2/Assets/Scripts/HttpApi/AbsSessionObj.cs

using Newtonsoft.Json;

namespace HttpApi
{
    public abstract class AbsSessionObj
    {
        [JsonProperty] protected readonly string session;
        
        protected AbsSessionObj(string session)
        {
            this.session = session;
        }
        
        public virtual string ToJson()
        {
            return JsonConvert.SerializeObject(this);
        }
    }
}