sse keepalive

[Fak3]

import asyncio
from django.http import StreamingHttpResponse

async def sse_stream(request):
    async def event_stream():
        # Example: send a keepalive ping every 15 seconds
        while True:
            yield f": keepalive \n\n"
            await asyncio.sleep(15)

    response = StreamingHttpResponse(event_stream(), content_type='text/event-stream')
    response['Cache-Control'] = 'no-cache'
    response['X-Accel-Buffering'] = 'no' # Disable Nginx buffering
    return response