Yes, the url in config.json should be equal to exactly the URL at which you access your site. It usually shouldn't be localhost or an IP address.
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But I get error each time refresh (F5).
Browser console output :
WebSocket connection to 'ws://22.214.171.124/socket.io/?EIO=3&transport=websocket&sid=272_fqLIM0WJupWXAAA1' failed: Error during WebSocket handshake: Unexpected response code: 400