everlight.eap/backend/WebApplet/Filters/QueryStringFilter.cs

using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc.Filters;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace WebApplet.Filters
{
    public class QueryStringFilter : IActionFilter
    {
        public void OnActionExecuted(ActionExecutedContext context)
        {
            //  OnActionExecuted(context);

        }

        public void OnActionExecuting(ActionExecutingContext context)
        {
            var queryString = context.HttpContext.Request.QueryString;
            queryString = QueryString.FromUriComponent(queryString.Value.Replace("+", "%2B"));
            context.HttpContext.Request.QueryString = queryString;

        }
    }
}