Browser extension reference: HTTP 402 detection and cookie unlock

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Summary

Build an OPE-compliant browser extension demonstrating HTTP 402 detection, OPE header parsing, and cookie-based content unlock.

Context

Listed under Future Work Section 24 as a planned reference implementation.

Responsibilities

• Intercept HTTP 402 responses on pages matching publisher domains
• Parse OPE response headers (Link, OPE-Content-Id, OPE-Access-Level, OPE-Unlock-URL)
• Trigger the unlock flow via the publisher's unlock endpoint
• Set ope_grant cookie on successful authentication

Related

Spec sections: 11.1 HTTP 402 and OPE Response Headers, 11.2 Cookie-Based Grant Token Transport