symfony - $app->finish not triggering -

got strange 1 here. i'm done silex app, having problems getting $app->finish trigger. here's code:

<?php require_once __dir__ . '/../vendor/autoload.php';  $app = new silex\application();  $app->get('/', function (request $request) {     $batchprocess = function () {         long_process();     };     $app->finish($batchprocess);      return $app->json("ok", 200); };  $app->run(); 

so here's problem: batch process never runs! trying find bug, added var_export "on" function in silex\application:

/**  * adds event listener listens on specified events.  *  * @param string   $eventname event listen on  * @param callable $callback  listener  * @param integer  $priority  higher value, earlier event  *                            listener triggered in chain (defaults 0)  */ public function on($eventname, $callback, $priority = 0) {     $this['dispatcher'] = $this->share($this->extend('dispatcher', function ($dispatcher, $app) use ($callback, $priority, $eventname) {         $dispatcher->addlistener($eventname, $callback, $priority);          return $dispatcher;     }));     var_export($this['dispatcher']); } 

when var_export in there, works (though kernel runs batch process before sending data). when var_export commented out, "ok" returned , batch process never runs.

what doing wrong? why kernel terminating without executing process?

see comments igor wiedler:

there may way achieve 2 changes response class.

• the first adding ob_flush() before flush() in response::send().
• the second setting content-length header.

i able achieve same effect without modifying response class. first, need move callback set in finish middleware outside of get method, , check manually route ('get_' in case responds '/' path):

$app->finish(function() {     if ('get_' === $request->attributes->get('_route')) {         long_process();     } }); 

then here how get method should like:

$app->get('/', function(request $request) use ($app) {      $content = json_encode(array(         'status' => 'ok',     ));     $response = new response($content, 200);     $response->headers->set('content-type', 'application/json');     $response->headers->set('content-length', strlen($content));     $response->send();     ob_flush();      return $response; }); 

setting content-length important, or json content sent twice, $response returned in method, , sent silex.