array(
    'HTTP/1.1 401 Unauthorized',
    'Server' => 'ATS',
    'Date' => 'Mon, 25 Jan 2016 06:20:58 GMT',
    'Content-Length' => '0',
    'WWW-Authenticate' => 'Bearer realm="Service", error="invalid_token", error_description="The access token provided is invalid."',
    'Vary' => 'Accept-Encoding',
    'Age' => '0',
    'Connection' => 'keep-alive',

);