Update with new exception handler

src/Program.cs

@@ -16,6 +16,8 @@
 
 svcs.AddDbContext<BillingContext>();
 
+svcs.AddExceptionHandler<RestDesignExceptionHandler>();
+
 svcs.AddHttpCacheHeaders();
 
 svcs.AddCors(setup =>
@@ -72,6 +74,9 @@
 
 var app = builder.Build();
 
+// Using empty configuration to force it to use IExceptionHandler
+app.UseExceptionHandler(_ => { });
+
 if (app.Environment.IsDevelopment())
 {
   app.UseDeveloperExceptionPage();

src/Services/RestDesignExceptionHandler.cs

@@ -0,0 +1,57 @@
+using System.Text.Json;
+using System.Threading;
+using Microsoft.AspNetCore.Diagnostics;
+using Microsoft.AspNetCore.Http;
+using Microsoft.Extensions.Hosting;
+
+namespace RestDesign.Services;
+
+public class RestDesignExceptionHandler : IExceptionHandler
+{
+  private readonly IHostEnvironment _environment;
+
+  public RestDesignExceptionHandler(IHostEnvironment environment)
+  {
+    _environment = environment;
+  }
+
+  public async ValueTask<bool> TryHandleAsync(HttpContext httpContext,
+      Exception exception,
+      CancellationToken cancellationToken)
+  {
+    if (exception is not null)
+    {
+      httpContext.Response.StatusCode = StatusCodes.Status500InternalServerError;
+      httpContext.Response.ContentType = "application/json";
+
+      // Generate the response
+      object? error;
+
+      if (_environment.IsProduction())
+      {
+        error = new
+        {
+          Message = "Server Error. Please contact support.",
+          MessageKey = "exceptionThrownServer"
+        };
+      }
+      else
+      {
+        error = new
+        {
+          Message = exception.Message,
+          MessageKey = "",
+          StackTrace = exception.StackTrace,
+          ExceptionType = exception.GetType().Name,
+          InnerException = exception.InnerException?.ToString()
+        };
+      }
+
+      await httpContext.Response.WriteAsJsonAsync(error);
+
+      return true;
+    }
+
+    return false;
+  }
+}