HTTP: guidelines for common User-Agent: headers?

Question

I'm sure there's no official standard, but are there some guidelines for identifying and classifying browsers based on the User-Agent string they send?

Boris Guéry · Accepted Answer · 2010-04-30 09:13:59Z

1

According to the RFC 2616, here is the convention used by client to send their User-Agent.

User-Agent = "User-Agent" ":" 1*( product | comment )

Example:

User-Agent: CERN-LineMode/2.15 libwww/2.17b3

The header should contains a product token, and additional informations about version, used library by the client, etc.

But as you may know, User-Agent can totally be faked, so you can't really rely on it.

user-agents.org is a searchable database of user-agents

answered Apr 30, 2010 at 9:13

Boris Guéry

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