.

README.md

@@ -4,6 +4,7 @@
 
 
 ## .Net 8에서 GlobalErrorHandling이 추가됨
+* https://juliocasal.com/blog/Global-Error-Handling-In-AspNet-Core-APIs.html*
 * https://www.milanjovanovic.tech/blog/global-error-handling-in-aspnetcore-8
 * https://learn.microsoft.com/ko-kr/aspnet/core/fundamentals/error-handling?view=aspnetcore-8.0#produce-a-problemdetails-payload-for-exceptions
 

src/WebApplicationMinimalApi8/Dto/MessageDto.cs

@@ -1,18 +1,28 @@
 using FluentValidation;
+using Swashbuckle.AspNetCore.Filters;
 
 namespace WebApplicationMinimalApi8.Dto;
 
 public record MessageDto
 {
-    [SwaggerParameterExample]
-    public required string Body { get; init; }
+
+    public string Body { get; init; } = "안녕하신지";
 
 }
 
 public class MessageDtoValidator : AbstractValidator<MessageDto>
 {
     public MessageDtoValidator()
     {
-        RuleFor(x => x.Body).NotEmpty();
+        RuleFor(x => x.Body).NotEmpty().NotNull();
     }
-}   
+}
+
+public class MessageDtoExmaple : IMultipleExamplesProvider<MessageDto>
+{
+    public IEnumerable<SwaggerExample<MessageDto>> GetExamples()
+    {
+        yield return SwaggerExample.Create("빈값", new MessageDto { Body = "" });
+        yield return SwaggerExample.Create("null", new MessageDto { Body = null });
+    }
+}

src/WebApplicationMinimalApi8/EndpointFilters/ResponseAddTraceIdFilter.cs

@@ -0,0 +1,35 @@
+using System.Diagnostics;
+using System.Text.Json.Nodes;
+using System.Text.Json;
+
+namespace WebApplicationMinimalApi8.EndpointFilters;
+
+public class ResponseAddTraceIdFilter : IEndpointFilter
+{
+    public static JsonNode AddTraceId(object? value, string id)
+    {
+        var root = JsonSerializer.SerializeToNode(value)!.Root;
+
+        root["traceId"] = id;
+
+        return root;
+    }
+
+    public async ValueTask<object?> InvokeAsync(EndpointFilterInvocationContext context, EndpointFilterDelegate next)
+    {
+        var id = Activity.Current?.Id ?? context.HttpContext.TraceIdentifier;
+        var ret = await next(context);
+
+        return ret switch
+        {
+            IStatusCodeHttpResult c => c switch
+            {
+                IValueHttpResult v => Results.Text(AddTraceId(v.Value, id).ToJsonString(), "application/json", statusCode: c.StatusCode),
+                { } v => v
+            },
+            _ => ret
+        };
+    }
+
+
+}

src/WebApplicationMinimalApi8/ExceptionHandlers/GlobalExceptionHandler.cs

@@ -1,5 +1,7 @@
+using System.Diagnostics;
 using System.Text.Json;
 using Microsoft.AspNetCore.Diagnostics;
+using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Http.Json;
 using Microsoft.AspNetCore.Mvc;
 
@@ -9,23 +11,17 @@ public sealed class GlobalExceptionHandler(ILogger<GlobalExceptionHandler> logge
 {
     public async ValueTask<bool> TryHandleAsync(HttpContext httpContext, Exception exception, CancellationToken cancellationToken)
     {
+        var traceId = Activity.Current?.Id ?? httpContext.TraceIdentifier;
         logger.LogError(exception, "Exception occurred: {Message}", exception.Message);
 
-        var problemDetails = new ProblemDetails
-        {
-            Status = StatusCodes.Status500InternalServerError,
-            Title = exception.Message,
-        };
-
-        httpContext.Response.StatusCode = problemDetails.Status.Value;
-
-        await httpContext.Response.WriteAsJsonAsync
-        (
-            value: problemDetails,
-            options: new(JsonSerializerDefaults.Web),
-            contentType: "application/problem+json",
-            cancellationToken
-        );
+        await Results.Problem(
+            title: exception.Message,
+            statusCode: StatusCodes.Status500InternalServerError,
+            extensions:  new Dictionary<string, object?>
+            {
+                ["traceId"] = traceId
+            }
+        ).ExecuteAsync(httpContext);
 
         return true;
     }

src/WebApplicationMinimalApi8/Program.cs

@@ -3,6 +3,7 @@
 using Microsoft.OpenApi.Models;
 using Swashbuckle.AspNetCore.Filters;
 using WebApplicationMinimalApi8.Dto;
+using WebApplicationMinimalApi8.EndpointFilters;
 using WebApplicationMinimalApi8.ExceptionHandlers;
 
 var builder = WebApplication.CreateBuilder(args);
@@ -35,8 +36,8 @@
 
 app.MapPost("/validate", (MessageDto message) => message)
    .WithDescription("메시지를 검증합니다.")
-
    .AddFluentValidationFilter()
+   .AddEndpointFilter<ResponseAddTraceIdFilter>()
    .WithOpenApi();
 
 app.MapGet("/500", () =>