nginx防盗链怎么设置才能不屏蔽搜索引擎？

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如题，按照下面两种方式设置，搜索引擎的爬虫还是会被屏蔽掉

1. valid_referers *.aaa.com server_names ~\.google\. ~\.baidu\.;

2. valid_referers *.aaaa.com *.google.com *.baidu.com;

123.125.71.105 - - [17/Jun/2017:00:45:51 +0800] "GET /******** HTTP/1.1" 403 162 "-" "Baiduspider-image+(+http://www.baidu.com/search/spider.htm)" -