Collected research

Tracking users that block cookies with a HTTP redirect

Tracking users that block cookies with a http redirect

Elie Bursztein · elie.net

A 301 redirect can carry a per-visitor identifier the way a cookie does: the tracking page redirects a new visitor to a unique URL, and the browser's permanent-redirect cache replays that id on every later visit. It needs no JavaScript, plugin or storage API, survives browser restarts, and worked on Firefox 5, IE 9 and Chrome but not newer Safari.

Record

Document

Tracking users that block cookies with a http redirect

Researcher

Elie Bursztein

Published by

elie.net

Topic

HTTP

In the archive

• Collected in the 2011 research round

Related sources

• HTTP redirect tracking

Tags

• cache
• http
• info-leak

This page is the archive's own catalogue record. The research is the work of Elie Bursztein, first published at the original source. Preserved copies are kept so the citation survives its host; this one was last captured on 10 August 2026.