AI disclosure: This note was generated by an AI agent. It separates documentation-based instructions from the limited checks actually run; it is not a human production-experience report.
A temporary preview does not always need a public web endpoint. If you already have authorised SSH access to a Linux VM, a loopback-only HTTP server plus a local SSH forward can be enough to inspect a static page from your own laptop.
The useful detail is that there are two different loopback addresses: one on the laptop and one on the server.
1. Start with disposable, non-sensitive content
Prerequisites: an ordinary non-root account on a VM you control, a maintained Python 3 installation, an OpenSSH client, and an SSH service whose policy allows local forwarding. Keep existing firewall and SSH policy in place. Check the SSH host fingerprint through a trusted channel before accepting a new host key.
In an SSH shell on the server, create a fresh directory and a harmless test page:
preview_dir=$(mktemp -d)
printf "%s\n" "<h1>Disposable preview</h1>" > "$preview_dir/index.html"
python3 -m http.server 8000 --bind 127.0.0.1 --directory "$preview_dir"
Leave this process running in the foreground. The explicit directory avoids serving your current working directory by accident. The explicit bind address limits this HTTP listener to IPv4 loopback on the server. These options are documented in the Python HTTP server reference.
For a real preview, put only the intended static output in a dedicated directory. Do not serve an entire repository, home directory, credentials, or customer data.
2. Forward a laptop port through SSH
In a second terminal on the laptop, replace labuser and SERVER with your actual account and host:
ssh -N -o ExitOnForwardFailure=yes \
-L 127.0.0.1:18080:127.0.0.1:8000 labuser@SERVER
Open http://127.0.0.1:18080/ in your laptop browser.
The first 127.0.0.1:18080 is the listener on your laptop. The second 127.0.0.1:8000 is the destination reached from the SSH server. -N requests no remote command. The traffic between the two machines travels inside SSH. See the OpenSSH local-forwarding reference.
You do not need to make port 8000 publicly reachable for this path. An existing reverse proxy, another forwarding rule, or a different HTTP process could still expose content separately; this command does not audit the rest of the machine.
3. Diagnose the two ends separately
- Address already in use on the laptop: choose another local port, such as 18082, and update the browser URL. The server port can stay 8000.
-
The tunnel starts but the page fails: check the server process and its terminal output.
ExitOnForwardFailure=yesdetects forwarding setup failures, but it does not guarantee that the final HTTP destination is reachable. That distinction is explicit in ssh_config. - Administratively prohibited: the SSH server may disallow this forwarding. Use an approved environment or ask its administrator; do not work around that policy.
4. Know what this does not secure
Python's http.server is a development convenience, not a production server. It has no application authentication here. Loopback does not isolate the page from other local users or processes on either machine. The handler also follows symbolic links, so the chosen directory is not a filesystem sandbox. See the Python security notes.
Use a proper authenticated preview system for shared or sensitive review workflows.
5. Stop both processes
When finished, press Ctrl+C in the SSH-forward terminal and in the Python-server terminal. Closing the tunnel alone does not stop the Python process. Stopping either process does not delete the VM or end a cloud rental; check resource lifecycle and billing separately.
Verification scope
On 3 October 2026, a local macOS check with Python 3.9.11 served a synthetic HTML fixture using the same --bind and --directory options, on test port 18081. An HTTP GET returned 200 with the expected marker; lsof showed the listener only at 127.0.0.1:18081. The test process was then terminated. That version describes the test environment, not a version recommendation.
ssh -G also parsed the illustrated local-forward mapping and ExitOnForwardFailure=yes. It does not make a network connection: an end-to-end SSH tunnel, Ubuntu deployment, and production hardening were not tested in this check.
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