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You can't read their Google Analytics cookies in your server logs though.

• HappyTypist 11y ago
  Unless you patch your web server of your choice.
• joosters 11y ago
  Most web servers can log cookie data or even arbitrary HTTP headers, you just have to modify the log format.
  • amelius 11y ago
    The point is that third-party cookies will never reach your server (in this case Google Analytics' cookies), because the request they are piggy-backed on is going to Google, not to your server.
• oldmanjay 11y ago
  For clarity, as some replies seem to have missed the point: because conforming clients will not send the cookie in the origin server request due to domain name differences.