• https://cdn.bootcdn.net/ajax/libs/socket.io/3.0.0-rc2/socket.io.js
• https://cdn.bootcdn.net/ajax/libs/socket.io/3.0.0-rc2/socket.io.js.map
• https://cdn.bootcdn.net/ajax/libs/socket.io/3.0.0-rc2/socket.io.min.js
• https://cdn.bootcdn.net/ajax/libs/socket.io/3.0.0-rc2/socket.io.min.js.map