Is the WebSocket API intended to serve as a replacement for the REST API?

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No, the WebSocket API is not intended to serve as a replacement for the REST API. The WebSocket API is designed to provide real-time, bidirectional communication between client and server, while the REST API is designed for stateless, request/response communication. The WebSocket API is useful for applications that require frequent updates or real-time information, such as online gaming, chat applications, or financial trading applications. The REST API is still necessary for many types of applications that require a more traditional request/response architecture, such as e-commerce or content management systems.