What Google says about "vary user agent"

🎥 YouTube Videos 2

Should you really keep the Vary User-Agent header for your mobile sites?

Google 🎥 YouTube May 2013 ★★★

Google recommande de continuer à utiliser le header HTTP Vary User-Agent pour les sites mobiles servant du contenu différent selon l'apparei...

Is it really necessary to use the 'Vary: User-Agent' header on all your adaptive pages?

Google 🎥 YouTube May 2015 ★★★

Pour les pages web adaptatives proposant du contenu différent selon l'agent utilisateur, il est crucial d'utiliser le header HTTP 'Vary: Use...

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Google Mar 2020 ★★

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What Google says about « vary user agent »