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A comment on It is not possible to detect and block Chrome headless. Parent comment

Re:It is not possible to detect and block Chrome headless by Savageman on Thursday January 18, 2018 @03:08PM (#16180845)
The most trivial check is using the TCP packet TTL (Time To Live). Windows and Linux doesn't have the same default value so it's "easy" to recognize which one sent a specific packet.

Just look up for "ttl windows vs linux" to find tons of article about it :)

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