SSEResponse creates 'Access-Control-Allow-Origin': '*' issue

[sansyrox]

Bug Description

From Discord

I'm creating an app using Robyn Framework but keeps encountering CORS issue when streaming. I'm currently using ALLOW_CORS on my main.py but keeps encountering this issue:
Access to fetch at 'http://localhost:8087/scraping/crawl' from origin 'http://localhost:8910' has been blocked by CORS policy: The 'Access-Control-Allow-Origin' header contains multiple values '*, http://localhost:8910', but only one is allowed. Have the server send the header with a valid value. which is weird since there is no one calling * for Access-Control-Allow-Origin . I checked my other API endpoins and it's only throwing only 1 Access-Control-Allow-Origin but for my crawl API endpoint that is currently using SSEResponse it's thorwing 2 Access-Control-Allow-Origin

Steps to Reproduce

I'm using CORS on my main.py just like this:

app = Robyn(
    file_object=__file__,
    openapi=OpenAPI(
        info=OpenAPIInfo(
            title="Gen AI Scraper",
            description="Fanta Scraper but using generative AI",
            version="0.1.0",
            components=Components(),
        )
    ),
)
ALLOW_CORS(app, origins=[REDWOOD_URL])

Then on my API Endpoint

@scraping_router.post("/crawl", openapi_name="Crawlee Request with SSE")
async def crawlee_request(request: Request):
    try:
        if not hasattr(request, "user"):
            async def error_stream():
                yield SSEMessage(
                    event="error",
                    data=json.dumps({
                        "error": "Authentication context missing",
                        "status_code": 500
                    })
                )
            return SSEResponse(error_stream())
        try:
            body = request.json()
            crawl_request = CrawlRequest(**body)
        except Exception as e:
            return Response(
                status_code=400,
                headers={},
                description=json.dumps({"detail": f"Invalid request body: {str(e)}"})
            )
        url = crawl_request.url
        return SSEResponse(start_crawling_stream_sse(url))

    except Exception as e:
        logger.info(f":x: Error in crawl_stream: {str(e)}")
        return Response(
            status_code=500,
            headers={},
            description=json.dumps({"detail": str(e)})
        )
 

Your operating system

None

Your Python version (python --version)

None

Your Robyn version

None

Additional Info

No response

[eliifanta]

Operating System: Windows 11 64-bit
Python version: 3.12.7
Robyn Version: 0.72.0