Should I use the Vary HTTP header on URLs that redirect based on user-agent?

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What's Google's position about continuing to recommend the HTTP Vary: User-Agent header for specific mobile websites after big players like Akamai said they don't cache the URLs that include it? Would you still recommend using it?
Christian Oliveira, Madrid

More about redirects and user-agent detection:
https://developers.google.com/webmasters/smartphone-sites/redirects

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Tags:
google
seo
mobile
vary
http header
user-agent
redirect