They always obey robots.txt rules and generally crawl from the Google's common crawlers are used for building Google's search indices, perform other product Learn how to verify if a visitor is a Google crawler. The full user agent string is a full description of the crawler, and appears inĬaution: The user agent string can be easily spoofed. This list is not complete, but covers most crawlers you might see on your website. One token, as shown in the table you need to match only one crawler token for a rule toĪpply. To match a crawler type when writing crawl rules for your site. The user agent token is used in the User-agent: line in robots.txt How you may see in your referrer logs, and how to specify them inĮxhaustive, they only cover the most common requestors that may show up in log files. The following tables show the Google crawlers and fetchers used by various products and services, Google's main crawler used for Google Search is calledįetchers, like a browser, are tools that request a single URL when prompted by a user. Is used to automatically discover and scan websites by following links from one web page toĪnother. "Crawler" (sometimes also called a "robot" or "spider") is a generic term for any program that Google uses crawlers and fetchers to perform actions for its products, either automatically or Overview of Google crawlers and fetchers (user agents)
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