JSON Symfony 2 Browser-Kit HTTP_ACCEPT ACCEPT HTTP_CONTENT_TYPE CONTENT_TYPE. POST $data:
$client->request(
$method = 'POST',
$uri,
$parameters = array(),
$files = array(),
$server = array(
'HTTP_CONTENT_TYPE' => 'application/x-www-form-urlencoded; charset=UTF-8',
'HTTP_ACCEPT' => 'application/json',
),
$content = $data,
$changeHistory = true
);
$response = $client->getResponse();
$response_data = json_decode($response->getContent(), true);