diff --git a/service/Program.cs b/service/Program.cs
index afc49f9..3e44cc1 100644
--- a/service/Program.cs
+++ b/service/Program.cs
@@ -28,6 +28,24 @@ services.AddDbContext<AppDbContext>(optionsBuilder =>
 });
 var httpClientBuilder = services.AddHttpClient<JsonPlaceholderClient>();
 
+#region Exercise Phase 4
+
+httpClientBuilder.AddResilienceHandler("chaos", configure =>
+{
+    // Simulate network chaos by adding latency and random errors.
+    configure
+        .AddChaosLatency(0.10, TimeSpan.FromSeconds(3))
+        .AddChaosOutcome(0.15, () => new HttpResponseMessage(System.Net.HttpStatusCode.BadGateway))
+        .AddChaosOutcome(0.20, () => new HttpResponseMessage(System.Net.HttpStatusCode.ServiceUnavailable))
+        .AddChaosOutcome(0.10, () =>
+        {
+            Thread.Sleep(TimeSpan.FromSeconds(2)); // Delay the error response, as it would likely happen with a 504.
+            return new HttpResponseMessage(System.Net.HttpStatusCode.GatewayTimeout);
+        });
+});
+
+#endregion
+
 var app = builder.Build();
 app.UseSwagger();
 app.UseSwaggerUI(); // Swagger UI is available at http://localhost:8080/swagger/index.html