fastapi异步执行后返回数据_fastapi后台任务，接口先返回结果，再执行任务?

直接上代码

from exec import *
from fastapi import APIRouter, BackgroundTasks
from pydantic import baseModel, Field
import asyncio
import time

class ConfigModel(baseModel):
    control_vm_conf: dict = Field(title="master配置信息", default={})
    slaver_vm_conf: dict = Field(title="执行机配置信息", default={})


# 更新config配置的接口
@Router.post("/UpdateConfig", tags=["UpdateConfig"])
async def update_config(config_data: ConfigModel, backgroundTasks: BackgroundTasks):
    if config_data.control_vm_conf:
        print("更新config配置，标记为master")
        backgroundTasks.add_task(update_vm_config, "master", config_data.control_vm_conf)
    elif config_data.slaver_vm_conf:
        print("更新config配置，标记为slaver")
        backgroundTasks.add_task(update_vm_config, "slaver", config_data.slaver_vm_conf)
    else:
        print("缺少参数")
    return {"message": "config任务已提交"}

async def update_vm_config(vm_type: str, new_config: dict):
    """更新config配置"""
    key_list = ["control_mgmt_ip", "control_mgmt_netmask", "control_mgmt_gateway"]
    new_config_copy = new_config.copy()
    print(new_config)
    if vm_type == "master":
        # 检查传到参数 是否有数组中的字段
        for k in new_config_copy.keys():
            if not key_list.__contains__(k):
                if k == "control_mgmt_netmask":
                    new_config["control_mgmt_netmask"] = "255.254.0.0"
                elif k == "control_mgmt_gateway":
                    new_config["control_mgmt_gateway"] = "10.172.55.53"
                else:
                    print("config缺少{}字段".format(k))
    else:
        for k in new_config_copy.keys():
            if key_list.__contains__(k):
                new_config.pop(k)
                print("非master的config配置不允许有{}字段,已删除!".format(k))

    # 全量替换
    with open(r"C:testbinconfig.json", "w") as f:
        f.write(json.dumps(new_config))
    # 停监听
    Config.take_effect_config(vm_type)
    # 配ip
    if vm_type != "master":
        asyncio.create_task(Config.delete_mgmt_ip())

结果为：
1、接口先返回字典 {“message”: “config任务已提交”} 消息，状态为200
2、后台继续执行update_vm_config函数，直到完成