socket.io-client-dart
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WebSocketException: Connection to https://URL/socket.io/?EIO=3&transport=websocket# was not upgraded to websocket
WebSocketException: Connection to 'https://URL/socket.io/?EIO=3&transport=websocket#' was not upgraded to websocket
I am aslo facing the same issue, any update?
I have the same issue
Most of the time, this issue is not caused by this library itself. Instead, it may be caused by a server configuration issue either on Nginx or Apache, or by a socket version difference between the server and the client.
FYI Here is the solution: https://github.com/rikulo/socket.io-client-dart/issues/319