To advertise the existence of an HTTP service with mDNS, use:
```bash
dns-sd -R "Service X" _http._tcp . 80 path=/
```
To find the HTTP services on the local network, run:
```bash
dns-sd -B _http._tcp
Browsing for _http._tcp
DATE: ---Wed 03 Mar 2021---
17:48:45.207 ...STARTING...
Timestamp A/R Flags if Domain Service Type Instance Name
17:48:45.207 Add 2 9 local. _http._tcp. Service X
```
See /etc/services for a list of valid services.