Overview

Flask 3.1.2, released on August 19, 2025, fixes an issue with stream_with_context in async mode.

Main Features

Async stream_with_context fix

The stream_with_context decorator now works correctly with async generators, enabling response streaming with access to the request context.

python 
from flask import Flask, stream_with_context, Response

app = Flask(__name__)

@app.route('/stream')
async def streamed_response():
    @stream_with_context
    async def generate():
        for i in range(10):
            yield f'data: {i}\n\n'
    return Response(generate(), content_type='text/event-stream')

Sources