Fix #76

Author: juherr

src/ControllerInvoker.php

@@ -36,7 +36,7 @@ public function __invoke(
     ): ResponseInterface {
         // Inject the request and response by parameter name
         $parameters = [
-            'request'  => $request,
+            'request'  => self::injectRouteArguments($request, $routeArguments),
             'response' => $response,
         ];
         // Inject the route arguments by name
@@ -46,4 +46,13 @@ public function __invoke(
 
         return $this->invoker->call($callable, $parameters);
     }
+
+    private static function injectRouteArguments(ServerRequestInterface $request, array $routeArguments): ServerRequestInterface
+    {
+        $requestWithArgs = $request;
+        foreach ($routeArguments as $key => $value) {
+            $requestWithArgs = $requestWithArgs->withAttribute($key, $value);
+        }
+        return $requestWithArgs;
+    }
 }