code: private String convertToProtocolRelative(String pPrefix) {
      if (StringUtils.isEmpty(pPrefix)) {
        return null;
      }
      int index = StringUtils.indexOf(pPrefix, "://");
      if (index >= 0) {
        return pPrefix.substring(index + 1);
      }
      else {
        return pPrefix;
      }
    }
docs: Strips of protocol from given URL (if any protocol is included)
  @param pPrefix Prefix with protocol
  @return Prefix without protocol (protocol-relative mode)