在python流式处理请求中，在请求完成执行循环之前不接收响应

我正在尝试用python实现流式处理。我需要将巨大的结果从游标返回到RESTAPI。我在返回响应时将flask stream_与_上下文一起使用。但当我尝试使用stream=True标志进行请求时，我的请求将等待响应，直到游标执行所有数据

期望收到1至10个元素时，一个接一个得到收益的响应。但是test.py中的请求者会等待，直到所有元素都从service_runner.py处理完毕

from flask import Flask, stream_with_context, Response
import time, json
app = Flask(__name__)

@app.route('/')
def hello_world():
    return 'Hello, World!'

@app.route('/StreamData')
def StreamData():
    def stream1():
        for i in range(10):
            print(i)
            time.sleep(1) # this is to see requestor recives stream or not.
            yield json.dumps(i)
    return Response(stream_with_context(stream1()))

下面是代码示例。 服务_runner.py

from flask import Flask, stream_with_context, Response
import time, json
app = Flask(__name__)

@app.route('/')
def hello_world():
    return 'Hello, World!'

@app.route('/StreamData')
def StreamData():
    def stream1():
        for i in range(10):
            print(i)
            time.sleep(1) # this is to see requestor recives stream or not.
            yield json.dumps(i)
    return Response(stream_with_context(stream1()))

test.py

import requests, asyncio, aiohttp
URL='http://127.0.0.1:5000/StreamData'
def TestStream():
    req1 = requests.get(URL, stream=True)
    print(req1)
    for r in req1.iter_lines(chunk_size=1):
        print(r)

async def TestWithAsync():
    async with aiohttp.ClientSession() as session:
        async with session.get(URL) as resp:
            print(await resp.content.read())

def main():
    event_loop = asyncio.get_event_loop()
    event_loop.run_until_complete(TestWithAsync())
    event_loop.close()

if __name__=='__main__':
    TestStream()
    main()