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<b>Warning</b>:  session_start(): open(/var/lib/php/sessions/sess_l7235n1h3rl8duc58snnpoendi, O_RDWR) failed: No space left on device (28) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
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<b>Warning</b>:  session_start(): Failed to read session data: files (path: /var/lib/php/sessions) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
// retrieves url with HEAD
static bool urlExists(S url) {
  url = absoluteURL(url);
  HttpURLConnection conn = null;
  InputStream in = null;
  try {
    conn = (HttpURLConnection) new URL(url).openConnection();
    conn.setRequestMethod("HEAD");
    conn.setRequestProperty("X-No-Cookies", "1");
    in = conn.getInputStream();
    true;
  } catch (IOException e) {
    false;
  } finally {
    closeURLConnection(conn, in);
  }
}