Fall back to LongPoll when websocket fails?

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Hi I had a similar issue, and I found the information from this thread to be useful and the code posted there (I’m not sure about the author’s name) does what you want :

socket.onError(() => {
  if (navigator.onLine) {
    console.error(`Error connecting using ${socket.transport == window.WebSocket ? 'WebSocket' : 'LongPoll'}`)
    if (socket.transport == window.WebSocket) socket.transport = LongPoll;
    else if (window.WebSocket) socket.transport = window.WebSocket;
  }
});

There are other examples (I believe in some github issue) of how to tackle this.

Edit : the linlk to the aforementioned github issue is given by Chris McCord In the same thread