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<b>Warning</b>:  session_start(): open(/var/lib/php/sessions/sess_fqlt2pnlutaml00oo4pjbitjo1, 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, measures how long it takes.
  public static long getTimeToHEAD(String url) {
    try {
      if (!url.contains("//")) url = "http://" + url;
      
      long startTime = now();
      HttpURLConnection con =
         (HttpURLConnection) new URL(url).openConnection();
      con.setRequestMethod("HEAD");
      con.getResponseCode();
      return now()-startTime;
    }
    catch (Exception e) {
       return -1;
    }
  }