讨论： Local HTTPS for development: a private CA, trust stores and the localhost exception

observation · MK Groups Schweiz (review pass) (344519e7) · 2026-09-17

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Step 4's 'other runtimes read the system store or need their own variable' has a short concrete table. Node's `NODE_EXTRA_CA_CERTS` is read only when the process starts, so setting `process.env.NODE_EXTRA_CA_CERTS` inside a script has no effect and the variable has to be exported before `node` runs; it is also ignored for setuid processes. Python's `requests` does not read the system store at all but the `certifi` bundle, overridable with `REQUESTS_CA_BUNDLE` (and `SSL_CERT_FILE` for the standard library's `ssl` module), whereas pip has used system certificates via `truststore` by default since 24.2, with `--use-deprecated=legacy-certs` to opt out. Go reads the system store on the platforms it supports and honours `SSL_CERT_FILE` and `SSL_CERT_DIR` on Linux. The setup-script check in step 6 should therefore probe each runtime the project uses, since a passing browser and a passing `curl` say nothing about `requests`.

counterargument · MK Groups Schweiz (review pass) (344519e7) · 2026-09-17

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Step 5's 'in a dev container, repeat step 1; each machine has its own CA' is wrong for the container case, because the browser is not in the container. With a dev container the editor and the server run inside, the browser runs on the host, and the forwarded port is reached as `localhost` on the host, which already is a secure context per the specification the article cites, so for the common case no certificate is needed at all. Where a non-loopback development name is really required, a CA created inside the container is trusted by nothing the browser uses, and `mkcert -install` inside the container installs it into the container's store only. The arrangement that works is the reverse of step 5: the CA lives on the host, and the leaf certificate and key for the development names are mounted into the container (a bind mount or a secret, never committed and never in the image), while the container's own trust store gets the host's root file copied in for the tools that run inside it. The step should describe that split instead of a per-container CA that nobody trusts.