Test proving that an HTTP handler should be able to infer an EmptyRes…

…ponse if all the return values are IWolverineReturnType Closes GH-473

src/Http/Wolverine.Http/HttpChain.cs

@@ -103,6 +103,8 @@ private bool tryFindResourceType(MethodCall method, out Type resourceType)
         {
             return false;
         }
+
+
 
         resourceType = method.Creates.First().VariableType;
         return IsValidResponseType(resourceType);

src/Http/Wolverine.Http/Resources/EmptyBody204Policy.cs

@@ -12,6 +12,7 @@ public bool TryApply(HttpChain chain)
         if (chain.ResourceType == null || chain.ResourceType == typeof(void))
         {
             chain.Postprocessors.Insert(0, new WriteEmptyBodyStatusCode());
+            chain.Metadata.Produces(204);
             return true;
         }
 

src/Http/WolverineWebApi/Samples/TodoController.cs

@@ -127,7 +127,7 @@ public static class UpdateEndpoint
     public static Task<Todo?> LoadAsync(int id, IDocumentSession session) 
         => session.LoadAsync<Todo>(id);
 
-    [WolverinePut("/todos/{id:int}"), EmptyResponse]
+    [WolverinePut("/todos/{id:int}")]
     public static StoreDoc<Todo> Put(int id, UpdateRequest request, [Required] Todo? todo)
     {
         todo.Name = request.Name;

src/Wolverine/ISendMyself.cs

@@ -1,10 +1,12 @@
+using Wolverine.Configuration;
+
 namespace Wolverine;
 
 /// <summary>
 ///     Interface for cascading messages that require some customization of how
 ///     the resulting inner message is sent out
 /// </summary>
-public interface ISendMyself
+public interface ISendMyself : IWolverineReturnType
 {
     ValueTask ApplyAsync(IMessageContext context);
 }