Proxy DataFast with FastAPI

pip install fastapi uvicorn httpx

from fastapi import FastAPI, Request
from fastapi.responses import Response
import httpx

app = FastAPI()

def get_client_ip(request: Request) -> str:
    """Get the real client IP address"""
    # Check X-Real-IP header first
    if x_real_ip := request.headers.get("x-real-ip"):
        return x_real_ip
    
    # Check X-Forwarded-For header
    if x_forwarded_for := request.headers.get("x-forwarded-for"):
        return x_forwarded_for.split(",")[0].strip()
    
    # Fallback to client.host
    return request.client.host if request.client else ""

@app.get("/js/script.js")
async def proxy_script():
    async with httpx.AsyncClient() as client:
        response = await client.get('https://datafa.st/js/script.js')
        return Response(
            content=response.content,
            media_type='application/javascript',
            headers={
                'Cache-Control': 'public, max-age=31536000'
            }
        )

@app.post("/api/events")
async def proxy_events(request: Request):
    body = await request.json()
    
    # Get origin from request or construct from base URL
    origin = request.headers.get('origin') or str(request.base_url).rstrip('/')
    
    # Get client IP for accurate location tracking
    client_ip = get_client_ip(request)
    
    async with httpx.AsyncClient() as client:
        response = await client.post(
            'https://datafa.st/api/events',
            json=body,
            headers={
                'Content-Type': 'application/json',
                'User-Agent': request.headers.get('user-agent'),
                'Origin': origin
            }
        )
        return Response(
            content=response.content,
            media_type='application/json',
            status_code=response.status_code
        )

if __name__ == "__main__":
    import uvicorn
    uvicorn.run(app, host="0.0.0.0", port=8000)

<script
  defer
  data-website-id="dfid_******""
  data-domain="yourdomain.com"
  src="/js/script.js"
></script>