private void checkNameAndValue(String name, String value) {
   if (name == null) throw new NullPointerException("name == null");
   if (name.isEmpty()) throw new IllegalArgumentException("name is empty");
   for (int i = 0, length = name.length(); i < length; i++) {
    char c = name.charAt(i);
    if (c <= '\u0020' || c >= '\u007f') {
     throw new IllegalArgumentException(Util.format(
       "Unexpected char %#04x at %d in header name: %s", (int) c, i, name));
    }
   }
   if (value == null) throw new NullPointerException("value == null");
   for (int i = 0, length = value.length(); i < length; i++) {
    char c = value.charAt(i);
    if ((c <= '\u001f' && c != '\t') || c >= '\u007f') {
     throw new IllegalArgumentException(Util.format(
       "Unexpected char %#04x at %d in %s value: %s", (int) c, i, name, value));
    }
   }
  }

ssid = URLEncoder.encode(ssid);