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实现服务器端推送消息的目的，主要有三种实现方式

🤔 1.HTTP定时轮询

In small time fragments (usually 1-2sec), continuously send http request to server to get the information that we are waiting for.
 

🤔 2.长轮询机制，comet技术

set the http overtime to a longer time, when we send a request, we tolerate a very long (usually 20-30 sec) response delay.
 

🤔 3.Websocket

The advantage of WebSocket is its ability to establish and maintain a persistent, full-duplex communication channel between the client and the server. This allows for real-time, bi-directional data transfer without the need for continuous polling or long response delays. WebSocket is efficient, low-latency, and well-suited for applications that require instant updates or real-time interaction.
REST.GraphQL.RPC.gRPC.tRPCRecord a reverse engineering, intercept and tamper with the back-end response, and successfully schedule the physical examination