Access Test Server from devices in same Network using local IP address or `web-platform-test.local`

[louaybassbouss]

For some APIs (e.g. Presentation API) we need to access the Test Server e.g. running on a PC from other devices in the Network. This is not possible since the Test server only allows specific domains (defined in host file, see README.md). A possible solution is to advertise the Test Server in local Network using MDNS/DNS-SD (user tools like dns-sd or avahi). this is a example for how to do it using dns-sd:

$ dns-sd -P web-platform-test-service _http._tcp local 8000 web-platform-test.local 127.0.0.1

Then we need to allow the Test Server to accept requests to web-platform-test.local.
This solution can be also used to run local tests on mobile devices like Android or iOS in same network.

[filmaj]

Yes please, I'm trying to leverage these tests to check spec adherance in mobile browsers and the native WebView implementations on various mobile platforms (via projects like Apache Cordova).

[filmaj]

I was able to work around this by doing the following:

• copy config.default.json from the root of the repo to config.json
• edit the host property in this JSON file and change it to be my local-network IP (e.g. 192.168.1.xxx)
• run ./wpt serve
• load up http://192.168.1.xxx:8000 on my phone, as long as it is connected to the same wifi network

[foolip]

@louaybassbouss, @filmaj, is this blocking Presentation API tests from being put into web-platform-tests? Do you know roughly how "much" of the Presentation API is blocked on this? Labeling as backlog for now, but if it affects many parts of the platform we should eventually increase the priority.

@mfoltzgoogle FYI