No credentials in response from EC2_SERVER_URI

[styxiak]

First request to http://169.254.169.254/latest/meta-data/iam/security-credentials/ return role name, but credentials is expected.
Second request returns credentials. In my case working function is:

private function getInstanceProfileCredentials()
    {
        $url = self::EC2_SERVER_URI.self::CRED_PATH;
        $curl_result = $this->curl($url);
        $response = trim($curl_result['content']);
        $url = self::EC2_SERVER_URI.self::CRED_PATH.$response;
        $curl_result = $this->curl($url);
        $response = $curl_result['content'];
        $result = $this->decodeResult($response);
        return [
            'key' => $result['AccessKeyId'],
            'secret' => $result['SecretAccessKey'],
            'token' => $result['Token'],
            'expiration' => strtotime($result['Expiration']),
        ];
    }

[ajoseph-godaddy]

I can confirm the above worked for me as well as I just ran into this issue.