SameSite=Strict prevents cookies from being sent when iframe content
(like the LND UI at /app/lnd/) fetches endpoints on the parent origin
(/lnd-connect-info). Lax still protects against CSRF on POST requests
but allows same-site GET navigations and fetches from iframes.
This was the root cause of "Failed to fetch" on LND Connect.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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