Both the authorize and callback routes built the redirect URI with a
hardcoded `http://` and the Host header. Behind any TLS terminator that
produces `http://host:443/api/email/oauth/google/callback` — the wrong
scheme and, on a split-port setup, a dead port. Google then refuses the
authorize request or the token exchange, so OAuth email is unusable on
every HTTPS deployment unless GOOGLE_OAUTH_REDIRECT_URI is pinned by hand.
uvicorn's proxy-headers middleware already rewrites the scheme from
X-Forwarded-Proto for trusted proxies (on by default, trusting 127.0.0.1),
so request.url.scheme is correct both directly and behind a proxy.
Google requires the callback's redirect_uri to match the authorize one
exactly, so both sites change together. An explicit
GOOGLE_OAUTH_REDIRECT_URI still wins, unchanged.
Léo
3bea7a53ee