Add proposals for local device discovery.

[dajiaji]

The use cases and requirements document (https://httpslocal.github.io/usecases/) includes the requirements for local device discovery.

[greggman]

Do I want local device discovery? Ideally I don't want every app on my phone/tv/ps4/tablet/phone to be able to scan my network for all the devices that have non-exploits and hack them. So it feels like whatever discovery method there is it needs to be both not required (I can turn it off and still access the devices directly) and/or require optional authentication to use?

[thw0rted]

I think of this like <input type="file" accept="image/png">. The code on the page can't discover all the PNG files on my system, but when the browser asks me to pick a file to expose to the code, it gets a hint to prioritize PNG files. Maybe the protocol could let the user agent do local network discovery (UPnP / multicast / whatever) then apply some kind of hinting to promote/filter certain device classes and present the user with a selection dialog?

I would still worry, though, because Users Don't Read and it would be hard to design a dialog that's sternly-worded to enough to discourage them from granting some random malware full access to their NAS full of tax returns.

[igarashi50]

I have the same view as @thw0rted