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main.py

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+from fastapi import FastAPI, WebSocket
+from fastapi.responses import HTMLResponse
+
+app = FastAPI()
+
+with open("index.html", "r") as file:
+    html = file.read()
+
+@app.get("/")
+async def get():
+    return HTMLResponse(html)
+
+
+@app.websocket("/ws")
+async def websocket_endpoint(websocket: WebSocket):
+    await websocket.accept()
+    while True:
+        data = await websocket.receive_text()
+        await websocket.send_text(data)