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==Protocol==
Use WebSockets if you have to exchange data with a high frequency or if you have to send messages from the server to the client without techniques like [polling https://en.wikipedia.org/wiki/Polling_(computer_science)polling]. In contrast to REST, WebSockets use a single URL for the whole communication.
The WebSocket protocol was standardized in [https://tools.ietf.org/html/rfc6455 RFC 6455] by the IETF. After an initial HTTP request, all communication takes place over a single TCP connection. Unlike the HTTP protocol, a connection will be kept alive, and a server can send unsolicited data to the client.
