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    Expert tip

    Check if you didn't set RequestProperty Content-Type to the wrong type or if you're trying to send the wrong file to the server.

Solutions on the web

via Google Groups by stevenmo, 1 year ago
via GitHub by fangzehua
, 1 year ago
Error while handshaking
via Stack Overflow by ilyesmilano
, 3 days ago
Error while handshaking Invalid Http response	at	at io.socket.IOConnection.handshake(	at io.socket.IOConnection.access$8(	at io.socket.IOConnection$