Add project files.

Core.Cerberos.Adapters/Extensions/TrackingMechanismExtension.cs

@@ -0,0 +1,23 @@
+using Microsoft.AspNetCore.Http;
+
+namespace Core.Cerberos.Adapters.Extensions
+{
+    public sealed class TrackingMechanismExtension : DelegatingHandler
+    {
+        private readonly IHttpContextAccessor _httpContextAccessor;
+
+        public TrackingMechanismExtension(IHttpContextAccessor httpContextAccessor)
+        {
+            _httpContextAccessor = httpContextAccessor ?? throw new ArgumentNullException(nameof(httpContextAccessor));
+        }
+
+        protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
+        {
+            if (_httpContextAccessor.HttpContext.Items.TryGetValue("TrackingId", out var trackingId))
+            {
+                request.Headers.Add("TrackingId", trackingId.ToString());
+            }
+            return await base.SendAsync(request, cancellationToken).ConfigureAwait(false);
+        }
+    }
+}