Fastapi Download New! -

FastAPI provides high-performance tools for managing file downloads, primarily through the FileResponse and StreamingResponse classes. Whether you are serving small static assets or massive datasets, choosing the right method ensures minimal memory usage and a smooth user experience. 1. Basic File Downloads with FileResponse

from fastapi.responses import StreamingResponse import aiofiles # Use an async generator to stream data to the client async def stream_file(): async with aiofiles.open("large.zip", mode="rb") as f: while chunk := await f.read(1024 * 1024): yield chunk return StreamingResponse(stream_file(), media_type="application/zip") Use code with caution. fastapi download

To trigger a browser download instead of just displaying the file, you must provide a filename argument. This sets the Content-Disposition header. Basic File Downloads with FileResponse from fastapi

from fastapi.responses import FileResponse # Inside a route function, return a FileResponse for local files return FileResponse(path="file.pdf", filename="downloaded_file.pdf") Use code with caution. 2. Downloading Large Files with StreamingResponse from fastapi