What's port 80/udp used for?

Coding
1

I know Caddy isn’t using it (yet?)

I just ended up here and I noticed it’s assigned to http.

I didn’t know that. Is it an edge case or should we expect to see it in the future?

2

Caddy does not use UDP on port 80. It only uses UDP on port 443 for HTTP/3.

3

I know that.

I was surprised in discovering that port assignation and I’m asking assuming somebody here knows what 80/udp is supposed to be used for. (I haven’t found much other than that assignation, even h2c is tcp only, and I don’t think http/3 has an equivalent for that)

4

It’s probably just reserved so nobody else tries to claim it which would be confusing because there’s already precedent for port 80 to mean HTTP and 443 to mean HTTPS.

1 Like
5

Also mentioned here RFC 9110: HTTP Semantics

1 Like
6

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