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3 bytes added ,  13:42, 18 October 2018
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Notice that there is no specification of a message-protocol. The WebSocket protocol just specifies the message-architecture but not how the payload of the messages is formatted. To agree on a format between the server and the client one can use subprotocols.
Some older browsers don't support the WebSocket protocol. Therefore you can use fallback options like Ajax. JavaScript clientlibarys client libraries like SockJs can be used for building client applications. The library takes care of how to establish the real-time connection. If the WebSocket protocol isn't supported it uses polling. You have to provide server functions for the fallback solutions if you have to support fallbacks.
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