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web workflow: uses an mdns port service slot

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@ -94,6 +94,10 @@ MDNS is used to resolve [`circuitpython.local`](http://circuitpython.local) to a
hostname of the form `cpy-XXXXXX.local`. The `XXXXXX` is based on network MAC address. The device hostname of the form `cpy-XXXXXX.local`. The `XXXXXX` is based on network MAC address. The device
also provides the MDNS service with service type `_circuitpython` and protocol `_tcp`. also provides the MDNS service with service type `_circuitpython` and protocol `_tcp`.
Since port 80 (or the port assigned to `CIRCUITPY_WEB_API_PORT`) is used for MDNS, the `mdns`
[module](https://docs.circuitpython.org/en/latest/shared-bindings/mdns/index.html#mdns.Server.advertise_service)
can't also advertise a service on that port.
### HTTP ### HTTP
The web server is HTTP 1.1 and may use chunked responses so that it doesn't need to precompute The web server is HTTP 1.1 and may use chunked responses so that it doesn't need to precompute
content length. content length.