HTTP Network Paths

When UDP is not available, switches may support a fallback HTTP path. This is primarily useful when telehash is running inside a browser, or when an app needs to operate inside a highly restricted network that offers only HTTP.

This path is implemented using socket.io, and the only information needed to be exchanged in an paths is a {"type":"http","http":"http://1.2.3.4:5678/"}.

The socket.io interface is a minimal "packet" event being generated by either side, with it's arguments being a single object of {"data":"base64-encoded-packet"} where the raw binary telehash packet is base64'd and included as a data key/value.