Update HttpKernel.php
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@ -62,7 +62,7 @@ class HttpKernel implements HttpKernelInterface, TerminableInterface
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*/
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public function handle(Request $request, $type = HttpKernelInterface::MASTER_REQUEST, $catch = true)
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{
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$request->headers->set('X-Php-Ob-Level', ob_get_level());
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$request->headers->set('X-Php-Ob-Level', (string) ob_get_level());
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try {
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return $this->handleRaw($request, $type);
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