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kav2k

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[ my public key: https://keybase.io/xan; my proof: https://keybase.io/xan/sigs/HeMCAdpCLz2AFPILt_ck0BxM83RCKLL_QT2-ZUxDS2w ]

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The reply is generated by the server in question, using information available to it.

Essentially, the point here is that WhatsApp is "clicking" the link (to generate a preview) with a resulting connection from the client's device, without user interaction.

So you can send a link to a server you control and harvest the recipient's client device IP, without the need for them to click on it.

ProtonVPN 9 years ago

Note: "interesting" parts are not included in the free offer.