Spring boot SSE(Server-Sent Event) DEMO

Front end

• HTML5 + Javascript codes generated by GPT-4
• Connect to GET /events when page initialized
• Two buttons(1 and 2), clicked to emit json message to POST /events, like { "text": "sendButton1" }
• Receive Event (json formated) from SSE connection, like { "target": "sendButton1", "event": "clicked" }
• Update the coutner of clicked times for current clicked button

Backend, server side(powered by Spring boot)

• GET /events, SSE endpoint
• POST /events, for web client emit message to backend
• return/response immediately
• later, here can trigger a BPMN workflow, then return/response immediately
• after a workflow finished, emit the result to specialized SSE connection