There is a standard for HTTP_USER_AGENT?

Yandex browser
Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2526.111 YaBrowser/16.3.0.7843 Yowser/2.5 Safari/537.36


Google Chrome
Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.112 Safari/537.36


The Mozilla Foundation
Mozilla/5.0 (Windows NT 6.3; WOW64; rv:45.0) Gecko/20100101 Firefox/45.0


How to determine reliably what unit? The words constantly repeated, Mozilla everywhere Mozilla is mentioned in Yandex and Chrome.
July 12th 19 at 17:33
1 answer
July 12th 19 at 17:35

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