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HTTP/2 has a great feature called server push. It enables the server to send multiple responses in parallel for one request. In a blogpost on the Symfony Finland blog Jani Tarvainen demonstrates how to make use of server push with the Symfony Kernel.
$app->get('/images'), function () use ($app) {
$images = array('/images/1.jpg','/images/2.jpg','/images/3.jpg');
$response = new JsonResponse($images);
foreach($images as $image){
$response->headers->set('link','<' . $image . '>; rel=preload; as=image',false);
}
return $response;
Read the entire article for some more background info.
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