std::string encodeBase64(const std::string& input) {
  return Base64::encode(folly::ByteRange(
                            reinterpret_cast<const uint8_t*>(input.c_str()),
                            input.length()));
}
std::string encodeBase64(const std::string& input) {
  return Base64::encode(folly::ByteRange(
                            reinterpret_cast<const uint8_t*>(input.c_str()),
                            input.length()));
}