better link header

Author: Tom Schlick

src/Http2ServerPushMiddleware.php

@@ -3,7 +3,7 @@
 namespace TomSchlick\ServerPush;
 
 use Closure;
-use Illuminate\Support\Facades\Request;
+use Illuminate\Http\Request;
 
 /**
  * Class Http2ServerPushMiddleware
@@ -31,7 +31,8 @@ public function handle(Request $request, Closure $next)
 
     protected function addServerPushHeaders()
     {
-        foreach (app('server-push')->generateLinks() as $link) {
+        if(app('server-push')->hasLinks()) {
+            $link = implode(',', app('server-push')->generateLinks());
             $this->response->headers->set('Link', $link, true);
         }
     }

src/HttpPush.php

@@ -45,6 +45,14 @@ public function generateLinks() : array
         return $links;
     }
 
+    /**
+     * @return bool
+     */
+    public function hasLinks() : bool
+    {
+        return !empty($this->resources);
+    }
+
     /**
      * Clear all resources out of the queue.
      */