if non wildcard is nil, try wildcard route

tree.go

@@ -24,12 +24,24 @@ func newTree() *tree {
 
 func (t *tree) Lookup(path string) http.HandlerFunc {
 	if path == "/" || path == "" {
-		return t.handler
+		if t.handler != nil {
+			return t.handler
+		}
+		if n, ok := t.next[Wildcard+Wildcard]; t.handler == nil && ok {
+			foo := n.handler
+			return foo
+		}
+		return nil
 	}
 	key, following := nextPathSegment(path)
-	if n, ok := t.next[key]; ok {
-		return n.Lookup(following)
-	} else if n, ok := t.next[Wildcard]; ok {
+	n, ok := t.next[key]
+	if ok {
+		n2 := n.Lookup(following)
+		if n2 != nil {
+			return n2
+		}
+	}
+	if n, ok := t.next[Wildcard]; ok {
 		foo := n.Lookup(following)
 		if foo != nil {
 			return func(w http.ResponseWriter, r *http.Request) {
@@ -37,6 +49,14 @@ func (t *tree) Lookup(path string) http.HandlerFunc {
 				foo(w, r)
 			}
 		}
+	} else if n, ok := t.next[Wildcard+Wildcard]; ok {
+		foo := n.handler
+		if foo != nil {
+			return func(w http.ResponseWriter, r *http.Request) {
+				r.Header.Add(WildcardHeader, key)
+				foo(w, r)
+			}
+		}
 	}
 	return nil
 }