Developer finds ad bid requests hide audience data server-side, not in client traffic

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A developer analyzed real-time bidding (RTB) network traffic on a single browser to locate their own advertising profile within bid requests. After examining 579 candidate request rows over four days, no recognizable audience targeting data was found in the request bodies. The investigation revealed that most audience enrichment happens server-side, meaning it is invisible from the client's vantage point. A key technical finding was that truncating request URLs at 500 characters caused entire exchanges — such as ssp01.rambler.ru, which carries real targeting parameters — to disappear from analysis entirely. The study also identified a distinct third state in privacy measurement: a field that is consistently requested but always empty, which is neither the same as carrying data nor as not requesting it at all.

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