/healthz is hit over 127.0.0.1 (the deploy probe) and localhost (the container's
own healthcheck) before any proxy has supplied a real Host header. With only the
public domain in ALLOWED_HOSTS, Django 400s both, the container is marked unhealthy
forever, and the deploy never goes green — which is how the first real deploy
failed.
The loopback is now appended unconditionally. It widens nothing: gunicorn binds to
the loopback only and the proxy owns the public domains, so nothing external can
present these hosts. Tested with a non-loopback ALLOWED_HOSTS.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
/healthz checks the database and does a cache ROUND TRIP, not a ping. Both matter:
a node that cannot reach Postgres serves nothing, and a cache that accepts writes
and returns nothing would have waffle read every feature flag as unset -- so
"healthy" has to mean more than "the process is listening", or the load balancer
will keep feeding traffic to a node that only looks alive.
No auth and no tenant on it: the proxy, and later a load balancer, must reach it on
any host.
DEPLOYMENT.md is the runbook, and leads with the five things that make this app not
a generic Django deploy: the wildcard cert forces DNS-01 (Let's Encrypt will not
issue a wildcard over HTTP-01); Redis is required on one server, not two, because
of the per-process flag cache; SECURE_PROXY_SSL_HEADER plus Caddy's
X-Forwarded-Proto or WebAuthn and the SSL redirect both break; uploads must reach
object storage BEFORE the second app server, not during; and invoices need native
pango.
Also documents why the archive job ships with --commit off, why migrations are run
explicitly rather than from the entrypoint, and how to test the restore before the
day you need it.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Adds django-browser-reload: runserver already restarts on Python changes, but
the browser had to be refreshed by hand for every template or CSS edit. It also
watches static/, so a Tailwind rebuild now refreshes the page on its own.
Mounted only under DEBUG -- it injects a script into every HTML response and
serves an open event stream, neither of which belongs in production; a test
holds that line. Its endpoint is exempt from RequireMFAMiddleware, otherwise a
not-yet-enrolled staff user has the stream redirected away and live reload dies
on the MFA enrolment page, which is exactly a page we are restyling.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
