Merge pull request #4 from GrahamCampbell/patch-4

Responses may not be illuminate responses

Author: JacobBennett

src/Middleware/AddHttp2ServerPush.php

@@ -29,7 +29,7 @@ public function handle(Request $request, Closure $next)
     {
         $response = $next($request);
 
-        if ($response->isRedirection()) {
+        if ($response->isRedirection() || !$response instanceof Response) {
             return $response;
         }