FastAPIStreamingResponse dùng khi response lớn hoặc sinh dần như export CSV, proxy stream, AI token stream. FileResponse dùng trả file có sẵn trên disk và xử lý headers phù hợp.
Ví dụ streaming:
python
async def rows():
for row in data:
yield json.dumps(row) + "\n"
return StreamingResponse(rows(), media_type="application/x-ndjson")Cần chú ý client disconnect, timeout, backpressure và không giữ toàn bộ payload lớn trong memory.
StreamingResponse is used when a response is large or generated incrementally, such as CSV export, proxy streams or AI token streams. FileResponse returns an existing file from disk and handles suitable headers.
Streaming example:
python
async def rows():
for row in data:
yield json.dumps(row) + "\n"
return StreamingResponse(rows(), media_type="application/x-ndjson")Watch client disconnects, timeouts, backpressure and avoid holding a huge payload in memory.