Allow cross-origin connections to websocket #56
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Hi,
This is just a tiny pull-request to allow cross-origin connections to the websocket to fetch data. The code already adds cors headers for HTTP-requests, but the websocket library has it's own internal blocking mechanism that can be overridden by passing your own callback. I don't know if I've done this in an optimal way. This is my very first time playing around with Go code.
I have been playing around with my own map front-end that is a bit like a "virtual guide" that fetches Wikipedia articles from around you and reads them out loud using text-to-speech. To use it cross-origin connections need to be allowed. The map front-end I've been working on can be found at https://kivle.github.io/msfs-map and you can check out the code at https://github.com/kivle/msfs-map. I've built it using create-react-app and react-leaflet. Run vfrmap from this branch and then just open the map. It should automatically connect to ws://localhost:9000/ws.