<configuration><system.web><compilation debug="true" /><customErrors mode="On" defaultRedirect="DefaultError"><error statusCode="401" redirect="Http401Error"/><error statusCode="403" redirect="Http403Error"/><error statusCode="404" redirect="Http404Error"/><error statusCode="500" redirect="Http500Error"/></customErrors></system.web>
</configuration>

"ErrorPages": {"401": "/Error/Http401Page","403": "/Error/Http403Page","404": "/Error/Http404Page","500": "/Error/Http500Page"
}

public IConfigurationRoot Configuration { get; }internal static IDictionary<int, string> ErrorPages { get; } = new Dictionary<int, string>();

var builder = new ConfigurationBuilder().SetBasePath(env.ContentRootPath).AddJsonFile("appsettings.json", optional: true, reloadOnChange: true).AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true).AddEnvironmentVariables();Configuration = builder.Build();foreach (var c in Configuration.GetSection("ErrorPages").GetChildren())
{var key = Convert.ToInt32(c.Key);if (!ErrorPages.Keys.Contains(key)){ErrorPages.Add(key, c.Value);}
}

public class CustomErrorPagesMiddleware
{private readonly RequestDelegate _next;private readonly ILogger _logger;public CustomErrorPagesMiddleware(ILoggerFactory loggerFactory, RequestDelegate next){_next = next;_logger = loggerFactory.CreateLogger<CustomErrorPagesMiddleware>();}public async Task Invoke(HttpContext context){try{await _next(context);}catch (Exception ex){_logger.LogError(0, ex, "An unhandled exception has occurred while executing the request");if (context.Response.HasStarted){_logger.LogWarning("The response has already started, the error page middleware will not be executed.");throw;}try{context.Response.Clear();context.Response.StatusCode = 500;return;}catch (Exception ex2){_logger.LogError(0, ex2, "An exception was thrown attempting to display the error page.");}throw;}finally{var statusCode = context.Response.StatusCode;if (Startup.ErrorPages.Keys.Contains(statusCode)){context.Request.Path = Startup.ErrorPages[statusCode];await _next(context);}}}

public static class BuilderExtensions
{public static IApplicationBuilder UseCustomErrorPages(this IApplicationBuilder app){return app.UseMiddleware<CustomErrorPagesMiddleware>();}
}

app.UseCustomErrorPages();

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