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Certain values cannot be obtained from the browser. For these values, we send matching keys and values, and the server replaces the values upon receipt. For examples: {"td_ip": "td_ip"} is sent by the browser, and the server will update it to something like {"td_ip": ""}. td_ip values come from the X-Forwarded-For header.

All server values except td_ip are found by parsing the user-agent string. This is done server-side to ensure that it can be kept up to date.