Making authenticated requests to REST Server using JSON with Services API

$base_url = 'http://localhost/test_endpoint';
$data = array(
'username' => 'admin',
'password' => 'pass',
);
$data = http_build_query($data, '', '&');
$headers = array();
$options = array(
'headers' => array(
'Accept' => 'application/json',
),
'method' => 'POST',
'data' => $data
);
$response = drupal_http_request($base_url . '/user/login', $options);
$data = json_decode($response->data);
// Check if login was successful
if ($response->code == 200) {
// Now recycle the login cookie we recieved in the first request
$options['headers']['Cookie'] = $data->session_name . '=' . $data->sessid;
// Get info about a user
$data = array();
$options['data'] = http_build_query($data, '', '&');
$options['method'] = 'GET';
$response = drupal_http_request($base_url . '/user/123', $options);
}
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