Fixes #91 --ECL (#102)

Fix as per PR --ECL

src/Serval.Shared/Controllers/HttpResultFilter.cs

@@ -0,0 +1,23 @@
+using System.Diagnostics;
+
+namespace Serval.Shared.Controllers
+{
+    public class HttpResultFilter : ResultFilterAttribute
+    {
+        private readonly ILogger _logger;
+
+        public HttpResultFilter(ILoggerFactory loggerFactory)
+        {
+            _logger = loggerFactory.CreateLogger<HttpResultFilter>();
+        }
+
+        public override Task OnResultExecutionAsync(ResultExecutingContext context, ResultExecutionDelegate next)
+        {
+            if ((context.Result is ObjectResult r) && (r.StatusCode >= 400))
+            {
+                _logger.LogInformation($"Responded with code {r.StatusCode}. Trace: {Activity.Current?.Id}");
+            }
+            return base.OnResultExecutionAsync(context, next);
+        }
+    }
+}

src/Serval.Shared/Controllers/ServalControllerBase.cs

@@ -5,6 +5,7 @@
 [TypeFilter(typeof(OperationCancelledExceptionFilter))]
 [TypeFilter(typeof(NotSupportedExceptionFilter))]
 [TypeFilter(typeof(ServiceUnavailableException))]
+[TypeFilter(typeof(HttpResultFilter))]
 public abstract class ServalControllerBase : Controller
 {
     private readonly IAuthorizationService _authService;