We present a technique for enabling WiFi proximity detection in mobile web applications based on proximity-adaptive HTTP responses (PAHR). The technique requires zero installation on the client and is client platform independent. Our reference implementation ProxiMagic is low-cost and provides robust and responsive interactivity based on proximity detection. We demonstrate the technique's applicability through a real-world example application deployed during a month-long participatory art

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... tion. We document the reliability and suitability of the simple proximity detection employed in ProxiMagic through a controlled experiment.