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grimoire/proxy.py is the one reader of X-Forwarded-For and X-Forwarded-Proto. It takes the entry TRUSTED_PROXY_HOPS in from the right (default 1; a shorter header reads its leftmost entry; 0 trusts no proxy), so an entry a client puts left of the proxy's is never believed. Before this, with TRUST_PROXY_HEADERS on, the leftmost X-Forwarded-For entry keyed the login, register, forgot and reset rate limits and the audit log, and a client could choose it. The session cookie is Secure, and HSTS (max-age=31536000) is sent, exactly when the request is HTTPS by the trusted proxy's word. Plain HTTP is untouched and nothing redirects. SECURE_COOKIES is gone (a startup warning says so when it is still set); TRUST_PROXY_HEADERS=false still maps to 0 hops, with a warning to move to TRUSTED_PROXY_HOPS. Admin audit lines now use the same client address instead of the socket peer. The placeholder-key refusal keyed on SECURE_COOKIES, so it now refuses either placeholder key outright; the instance makes its own key when none is set. Family idea #5004 (IsHTTPS, trusted-hop X-Forwarded-Proto), canon v2. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>