Socket.io-client 부분 {transports : polling } 옵션

(참고: https://stackoverflow.com/questions/41381444/websocket-connection-failed-error-during-websocket-handshake-unexpected-respon) 

 

 

리액트로 채팅앱만드는거에서 이거 옵션을 안넣어주니

WebSocket connection failed: Error durnig WebSocket handshake: Unexpected response code:400 애러가 자꾸 발생했음