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Sure, it’s better than buying a new gallon each time, but it’s not exactly wonderful. As soon as it goes expires, we contact the server for a fresh copy, with a new expiration date.Specific crawlers are also known as user-agents (a crawler uses its user-agent to request a page.) Google's standard web crawler has the user-agent name attributes are non-case sensitive.Search engines may have different crawlers for different properties or purposes. For example, to show a page in Google's web search results, but not in Google News, use the following meta tag: Directives specified without a user-agent are valid for all crawlers.Back to top Several other directives can be used to control indexing and serving with the robots meta tag and the . The following table shows all the directives that Google honors and their meaning.Note: it is possible that these directives may not be treated the same by all other search engine crawlers.