如何避免UI在python flask中等待线程完成？

from flask import Flask, jsonify
import threading
import time

app = Flask(__name__)

def background_task():
    # 模拟长时间运行的任务
    time.sleep(10)
    print("任务完成")

@app.route('/start-task')
def start_task():
    thread = threading.Thread(target=background_task)
    thread.start()
    return jsonify({"message": "任务已开始执行"})

if __name__ == '__main__':
    app.run(debug=True)

from flask import Flask, jsonify
from concurrent.futures import ThreadPoolExecutor
import time

app = Flask(__name__)
executor = ThreadPoolExecutor(max_workers=5)

def background_task():
    # 模拟长时间运行的任务
    time.sleep(10)
    print("任务完成")

@app.route('/start-task')
def start_task():
    executor.submit(background_task)
    return jsonify({"message": "任务已开始执行"})

if __name__ == '__main__':
    app.run(debug=True)

from flask import Flask, jsonify
from flask_socketio import SocketIO
import time

app = Flask(__name__)
socketio = SocketIO(app)

def background_task():
    for i in range(10):
        time.sleep(1)
        socketio.emit('update_progress', {'data': i+1})
    socketio.emit('task_complete', {'data': '任务完成'})

@app.route('/start-task')
def start_task():
    socketio.start_background_task(background_task)
    return jsonify({"message": "任务已开始执行"})

if __name__ == '__main__':
    socketio.run(app, debug=True)