Update backend/routers/assessment.py

backend/routers/assessment.py

@@ -95,5 +95,9 @@ async def stream_events(assessment_id: str):
     return StreamingResponse(
         event_generator(),
         media_type="text/event-stream",
-        headers={"Cache-Control": "no-cache", "X-Accel-Buffering": "no"}
+        headers={
+            "Cache-Control": "no-cache", 
+            "X-Accel-Buffering": "no",
+            "Connection": "keep-alive"
+        }
     )