THtherein·Feb 16, 2025
Here using `layer4.matchers.*`
https://github.com/mholt/caddy-l4?tab=readme-ov-file#introdu...
In Caddy – The Ultimate Server with Automatic HTTPSmholt
caddy-l4
Go2020–2025
mholt / caddy-l4
caddy-l4
Layer 4 (TCP/UDP) app for Caddy
7Distinct people
11Mentions
0Explicit recommenders
1.8KGitHub stars
What to know before exploring
What it is
Layer 4 (TCP/UDP) app for Caddy
GitHub
Where it is used
No documented product use has been verified yet.
What people are saying
No recommendation phrase was found in the indexed comments.
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Also in these discussions
No other repository is repeatedly linked in the same discussions.
This week on Hacker News
Nov 7–Nov 14 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/14/2026, 3:56:07 PM UTC.
No direct repository links were found in the indexed HN discussions over the past seven days. Older discussions are available below.
Mentions over time
HN mentions by year11 dated mentions
Observed mentions: 2020-10-23 14:49:50 UTC to 2025-02-16 19:58:42 UTC.
Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.
View mention counts and date ranges
| Period | Start (UTC) | End (exclusive, UTC) | Mentions | Submissions | Comments |
|---|---|---|---|---|---|
| 2020 | 2020-01-01 00:00:00 UTC | 2021-01-01 00:00:00 UTC | 2 | 2 | 0 |
| 2021 | 2021-01-01 00:00:00 UTC | 2022-01-01 00:00:00 UTC | 1 | 1 | 0 |
| 2022 | 2022-01-01 00:00:00 UTC | 2023-01-01 00:00:00 UTC | 4 | 0 | 4 |
| 2023 | 2023-01-01 00:00:00 UTC | 2024-01-01 00:00:00 UTC | 0 | 0 | 0 |
| 2024 | 2024-01-01 00:00:00 UTC | 2025-01-01 00:00:00 UTC | 3 | 0 | 3 |
| 2025 | 2025-01-01 00:00:00 UTC | 2026-01-01 00:00:00 UTC | 1 | 0 | 1 |
What Hacker News says
11 sourcesIt supports it with the caddy-l4 plugin: https://github.com/mholt/caddy-l4. It was also indicated we might move the plugin into standard Caddy once given enough feedback from the user-base and are comfortable with the implementation solidity.
In Nginx Unit: open-source, lightweight and versatile application runtimeSounds like you're looking for a layer-4 proxy then. See https://github.com/mholt/caddy-l4
In Caddy 2.8Caddy can absolutely do both of those things.
- https://caddyserver.com/docs/modules/http.reverse_proxy.upst...
- https://github.com/mholt/caddy-l4
In Take a look at Traefik, even if you don't use containersWell, that's a bit off-topic from the parent comment, which was more about the Caddyfile supporting complex config (versus the underlying JSON config) and not really "complex usecases".
But that said, from a quick Google search... was this an RTMP stream? If so, I suppose you'd want to use https://github.com/mholt/caddy-l4 which is a plugin for Caddy that lets you do TCP-layer things. Caddy's standard distribution just ships an HTTP server (plus TLS and PKI, etc), which is layer-7
You might be able to use caddy-l4's "tee" handler to pipe into multiple "proxy" handlers. But I'm not sure anyone's tried this yet, I had no idea people did this sort of thing. I'd be interested to hear if it does work though.
In The future of Nginx: Getting back to our open source roots"Caddy L4" aka "Project Conncept" might be what you're looking for:
https://github.com/mholt/caddy-l4
"Project Conncept is an experimental layer 4 app for Caddy. It facilitates composable handling of raw TCP/UDP connections based on properties of the connection or the beginning of the stream."
In Show HN: Caddy v2.5.0Nice, this is kind of why I made Project Conncept. It's a powerful TCP and UDP stream multiplexer based on Caddy: https://github.com/mholt/caddy-l4
You can route raw TCP connections by using higher layer protocol matching logic like HTTP properties, SSH, TLS ClientHello info, and more, in composable routes that let you do nearly anything.
In Using SNI proxying and IPv6 to share port 443 between webappsI guess, except Caddy doesn't spawn any processes, it just "starts apps" which are configured in-process, pure Go.
Another example Caddy app is https://github.com/mholt/caddy-l4 which lets you do arbitrary TCP/UDP handling/proxying.
There's a list of available apps here https://caddyserver.com/docs/json/apps/ (the SSH app is not there yet, should be soon)
In Show HN: Caddy-SSHCaddy-l4: TCP/UDP routing, TLS termination for Caddy
4 points · Open discussionTCP/UDP proxying for Caddy v2 released
2 points · Open discussionShow HN: Project Conncept – Multiplex Over TCP/UDP with Composable Handlers
3 points · Open discussion