Ex handler.cs

using System;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Logging;
using Udr.Application;

namespace Udr.Web
{
    public class ExceptionHandler : IMiddleware
    {
        private readonly ILogger<ExceptionHandler> _logger;

        public ExceptionHandler(ILogger<ExceptionHandler> logger)
        {
            _logger = logger;
        }
        
        public async Task InvokeAsync(HttpContext context, RequestDelegate next)
        {
            var message = "unknown error";
            
            try
            {
                await next(context);
                return;
            }
            catch (AppError e)
            {
                _logger.LogWarning(e, "App error");
                message = e.Message;
            }
            catch (Exception e)
            {
                _logger.LogError(e, "Error while process request");
            }
            
            context.Response.StatusCode = 500;
            await context.Response.WriteAsJsonAsync(new { message});
        }
    }
    
}