diff --git a/src/bundles/Elsa.WorkflowServer.Web/Program.cs b/src/bundles/Elsa.WorkflowServer.Web/Program.cs
index d7f8181d3..5d20b3b54 100644
--- a/src/bundles/Elsa.WorkflowServer.Web/Program.cs
+++ b/src/bundles/Elsa.WorkflowServer.Web/Program.cs
@@ -19,7 +19,7 @@ using Proto.Persistence.SqlServer;
 const bool useMongoDb = false;
 const bool useSqlServer = false;
 const bool useDapper = false;
-const bool useProtoActor = true;
+const bool useProtoActor = false;
 const bool useHangfire = false;
 
 var builder = WebApplication.CreateBuilder(args);
diff --git a/src/modules/Elsa.Http/Activities/FlowSendHttpRequest.cs b/src/modules/Elsa.Http/Activities/FlowSendHttpRequest.cs
index 2f04d0d8a..2149ab64a 100644
--- a/src/modules/Elsa.Http/Activities/FlowSendHttpRequest.cs
+++ b/src/modules/Elsa.Http/Activities/FlowSendHttpRequest.cs
@@ -1,7 +1,9 @@
+using System.Reflection;
 using System.Runtime.CompilerServices;
 using Elsa.Extensions;
 using Elsa.Workflows.Core;
 using Elsa.Workflows.Core.Attributes;
+using Elsa.Workflows.Core.Contracts;
 using Elsa.Workflows.Core.Models;
 
 namespace Elsa.Http;
@@ -10,17 +12,21 @@ namespace Elsa.Http;
 /// Send an HTTP request.
 /// </summary>
 [Activity("Elsa", "HTTP", "Send an HTTP request.", DisplayName = "HTTP Request (flow)", Kind = ActivityKind.Task)]
-public class FlowSendHttpRequest : SendHttpRequestBase
+public class FlowSendHttpRequest : SendHttpRequestBase, IActivityPropertyDefaultValueProvider
 {
     /// <inheritdoc />
     public FlowSendHttpRequest([CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) : base(source, line)
     {
     }
-    
+
     /// <summary>
     /// A list of expected status codes to handle.
     /// </summary>
-    [Input(Description = "A list of expected status codes to handle.", UIHint = InputUIHints.MultiText)]
+    [Input(
+        Description = "A list of expected status codes to handle.",
+        UIHint = InputUIHints.MultiText,
+        DefaultValueProvider = typeof(FlowSendHttpRequest)
+    )]
     public Input<ICollection<int>> ExpectedStatusCodes { get; set; } = default!;
 
     /// <inheritdoc />
@@ -45,4 +51,14 @@ public class FlowSendHttpRequest : SendHttpRequestBase
     {
         await context.CompleteActivityWithOutcomesAsync("Timeout");
     }
+
+    object IActivityPropertyDefaultValueProvider.GetDefaultValue(PropertyInfo property)
+    {
+        if (property.Name == nameof(ExpectedStatusCodes))
+        {
+            return new List<int> { 200 };
+        }
+
+        return default!;
+    }
 }
\ No newline at end of file
diff --git a/src/modules/Elsa.Http/Activities/SendHttpRequestBase.cs b/src/modules/Elsa.Http/Activities/SendHttpRequestBase.cs
index ad7fc90d0..74a6327e1 100644
--- a/src/modules/Elsa.Http/Activities/SendHttpRequestBase.cs
+++ b/src/modules/Elsa.Http/Activities/SendHttpRequestBase.cs
@@ -11,6 +11,7 @@ namespace Elsa.Http;
 /// <summary>
 /// Base class for activities that send HTTP requests.
 /// </summary>
+[Output(IsSerializable = false)]
 public abstract class SendHttpRequestBase : Activity<HttpResponseMessage>
 {
     /// <inheritdoc />
diff --git a/src/modules/Elsa.Workflows.Core/Abstractions/Activity.cs b/src/modules/Elsa.Workflows.Core/Abstractions/Activity.cs
index aedd2e4a2..42f3d4c5f 100644
--- a/src/modules/Elsa.Workflows.Core/Abstractions/Activity.cs
+++ b/src/modules/Elsa.Workflows.Core/Abstractions/Activity.cs
@@ -78,10 +78,8 @@ public abstract class Activity : IActivity, ISignalHandler
     /// <inheritdoc />
     [JsonIgnore]
     public IDictionary<string, object> SyntheticProperties { get; set; } = new Dictionary<string, object>();
-
-    /// <summary>
-    /// Stores metadata such as x and y coordinates when created via the designer.
-    /// </summary>
+    
+    /// <inheritdoc />
     public IDictionary<string, object> Metadata { get; set; } = new Dictionary<string, object>();
 
     /// <summary>
diff --git a/src/modules/Elsa.Workflows.Core/Contracts/IActivity.cs b/src/modules/Elsa.Workflows.Core/Contracts/IActivity.cs
index e216fdc44..dd0855449 100644
--- a/src/modules/Elsa.Workflows.Core/Contracts/IActivity.cs
+++ b/src/modules/Elsa.Workflows.Core/Contracts/IActivity.cs
@@ -38,6 +38,11 @@ public interface IActivity
     [JsonIgnore]
     IDictionary<string, object> SyntheticProperties { get; set; }
     
+    /// <summary>
+    /// Metadata associated with the activity. This is typically used by the workflow designer to store information about the activity.
+    /// </summary>
+    IDictionary<string, object> Metadata { get; set; }
+    
     /// <summary>
     /// Invoked when the activity executes.
     /// </summary>
diff --git a/src/modules/Elsa.Workflows.Runtime/Middleware/Workflows/PersistActivityExecutionLogMiddleware.cs b/src/modules/Elsa.Workflows.Runtime/Middleware/Workflows/PersistActivityExecutionLogMiddleware.cs
index b8359cf76..8b8d47b54 100644
--- a/src/modules/Elsa.Workflows.Runtime/Middleware/Workflows/PersistActivityExecutionLogMiddleware.cs
+++ b/src/modules/Elsa.Workflows.Runtime/Middleware/Workflows/PersistActivityExecutionLogMiddleware.cs
@@ -56,7 +56,7 @@ public class PersistActivityExecutionLogMiddleware : WorkflowExecutionMiddleware
             var outputs = outputDescriptors.ToDictionary(x => x.Name, x =>
             {
                 if(x.IsSerializable == false)
-                    return default;
+                    return "(not serializable)";
                 
                 var cachedValue = activity.GetOutput(expressionExecutionContext, x.Name);