I like that they are using websockets to process the GET requests. I was thinking about this just this week and it occurred to me that the "Host Node" [1] doesn't even need to be a program, it could just be a browser since they also have websockets and a API for getting files. I made a POC (proof-of-concept / piece-of-crap) example for this idea: https://hostyoself.com
[1] https://github.com/alexellis/inlets#intro