net6conversion (#642)

* Converting to net6 startup and integration test formats

* Update to minimal api and using pagetitle

* Adjust functional test fixtures
Update ApiEndpoints package version

* Finish migration to minimal api startup

src/PublicApi/Middleware/ExceptionMiddleware.cs

@@ -0,0 +1,45 @@
+using System;
+using System.Net;
+using System.Threading.Tasks;
+using BlazorShared.Models;
+using Microsoft.AspNetCore.Http;
+using Microsoft.eShopWeb.ApplicationCore.Exceptions;
+
+namespace Microsoft.eShopWeb.PublicApi.Middleware;
+
+public class ExceptionMiddleware
+{
+    private readonly RequestDelegate _next;
+
+    public ExceptionMiddleware(RequestDelegate next)
+    {
+        _next = next;
+    }
+
+    public async Task InvokeAsync(HttpContext httpContext)
+    {
+        try
+        {
+            await _next(httpContext);
+        }
+        catch (Exception ex)
+        {
+            await HandleExceptionAsync(httpContext, ex);
+        }
+    }
+
+    private async Task HandleExceptionAsync(HttpContext context, Exception exception)
+    {
+        context.Response.ContentType = "application/json";
+
+        if (exception is DuplicateException duplicationException)
+        {
+            context.Response.StatusCode = (int)HttpStatusCode.Conflict;
+            await context.Response.WriteAsync(new ErrorDetails()
+            {
+                StatusCode = context.Response.StatusCode,
+                Message = duplicationException.Message
+            }.ToString());
+        }
+    }
+}