The HTTPS server block sent Strict-Transport-Security:
max-age=31536000; includeSubDomains. Browsers that visited HTTPS once
cached the policy and then silently upgraded the still-open HTTP
dashboard's fetches and frames to https — a scheme change is
cross-origin, so every /rpc/v1 call died 'No Access-Control-Allow-
Origin header' while the node was perfectly healthy (framework-pt
2026-09-01: the 'Failed to fetch' storm, dashboard 'not responding',
every app frame mixed-content-blocked).
Plain HTTP is a supported access mode BY DESIGN on this platform: the
node's certificate is optional and self-signed (Settings → Node
certificate, /ca.crt flow), and setup-node-ca.sh deliberately keeps
port 80 serving for devices that haven't installed the CA. So:
- port 80 sends no HSTS at all (with the rationale inline)
- port 443 sends max-age=0, which ACTIVELY DELETES the policy already
cached by affected browsers — leaving it absent would have kept every
stranded browser broken for a year
tests/lifecycle/bats/nginx-hsts.bats pins all three properties at the
gate: no live policy on :80, max-age=0 (never 31536000) on :443, and
no long-lived pin anywhere in the deployed config.
archipelago
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