Uploadcare\Helper::parseHttpHeaders PHP Method

    public static function parseHttpHeaders($raw_headers)
    {
        if (function_exists('http_parse_headers')) {
            return http_parse_headers($raw_headers);
        }
        $headers = array();
        $key = '';
        foreach (explode("\n", $raw_headers) as $i => $h) {
            $h = explode(':', $h, 2);
            if (isset($h[1])) {
                if (!isset($headers[$h[0]])) {
                    $headers[$h[0]] = trim($h[1]);
                } elseif (is_array($headers[$h[0]])) {
                    $headers[$h[0]] = array_merge($headers[$h[0]], array(trim($h[1])));
                } else {
                    $headers[$h[0]] = array_merge(array($headers[$h[0]]), array(trim($h[1])));
                }
                $key = $h[0];
            } else {
                if (substr($h[0], 0, 1) == "\t") {
                    $headers[$key] .= "\r\n\t" . trim($h[0]);
                } elseif (!$key) {
                    $headers[0] = trim($h[0]);
                    trim($h[0]);
                }
            }
        }
        return $headers;
    }

 /**
  * @param string|array $response
  */
 public function setResponseHeaders($response)
 {
     $this->responseHeaders = array_change_key_case(is_array($response) ? $response : \Uploadcare\Helper::parseHttpHeaders($response), CASE_LOWER);
 }