Google登录 - GoogleIdTokenVerifier会延迟验证令牌

Question

我已经实施了后端，它从Android或iOS设备接收Google登录令牌并尝试验证它。几个月前代码已经正常运行，它没有改变，但最近它开始拒绝所有令牌无效。当我尝试在发布时间大约10秒后再次使用先前失败的令牌重复验证时，它开始工作并返回用户信息。为什么会这样？

try {
    GoogleIdTokenVerifier verifier = new GoogleIdTokenVerifier.Builder(new NetHttpTransport(), new JacksonFactory()).setIssuer(ISSUER).build();

    GoogleIdToken idToken = verifier.verify(token);

    if (idToken != null) {

        Payload payload = idToken.getPayload();
        ExternalUserInfo externalUserInfo = new ExternalUserInfo();
        externalUserInfo.setId((String) payload.getSubject());
        externalUserInfo.setName((String) payload.get("given_name"));
        externalUserInfo.setFamilyName((String) payload.get("family_name"));
        externalUserInfo.setEmail(payload.getEmail());
        externalUserInfo.setLocale((String) payload.get("locale"));
        externalUserInfo.setSystemId(AuthorizationMapper.TYPE_GOOGLE);

        return externalUserInfo;
    } else { 
        logger.debug("Invalid Google Sign in token " + token);
    }
} catch (Exception e) {
    logger.error("Error while getting Google Sign in user info for token " + token, e);
}