FastAPI provides the StreamingResponse class to stream data to clients during API calls. While this functionality is intended for streaming data in a non-blocking manner, issues can arise when using a generator function with blocking operations or improper usage.
To ensure successful streaming, consider the following:
Consider the following Python code:
# app.py from fastapi import FastAPI, StreamingResponse from fastapi.responses import StreamingResponse import asyncio app = FastAPI() async def fake_data_streamer(): for i in range(10): yield b'some fake data\n\n' await asyncio.sleep(0.5) @app.get('/') async def main(): return StreamingResponse(fake_data_streamer(), media_type='text/event-stream') # or, use: ''' headers = {'X-Content-Type-Options': 'nosniff'} return StreamingResponse(fake_data_streamer(), headers=headers, media_type='text/plain') ''' # test.py (using httpx) import httpx url = 'http://127.0.0.1:8000/' with httpx.stream('GET', url) as r: for chunk in r.iter_raw(): # or, for line in r.iter_lines(): print(chunk)
This code demonstrates how to stream data from a generator function in a FastAPI application and consume it using the httpx library.
The above is the detailed content of How to Handle Streaming Responses Effectively in FastAPI?. For more information, please follow other related articles on the PHP Chinese website!