[Python] Python global variable in FastAPI not working as normal

I have a simple FastAPI demo app which achieve a function: get different response json by calling a post api named changeResponse. The changeResponse api just changed a global variable, another api return different response through the same global variable. On local env, it works correctly, but the response always changes after i just call changeResponse once, when i build this on docker.The code is as follows:

from typing import Optional
from fastapi import FastAPI
from util import read_json
import enum

app = FastAPI()

type = "00"

@app.post("/changeResponse")
async def handle_change_download_response(param:Optional[str]):
global type
type = param
print("type is "+type)
return {"success":"true"}

@app.post("/download")
async def handle_download(param:Optional[str]):
print("get download param: "+param)
if legalDownload(param):
print("type is "+type)
return read_json.readDownloadSuccessRes(type)
else:
return read_json.readDownloadFailRes()

def legalDownload(data:str)->bool:
return True


the dockerfile is as follows:

FROM tiangolo/uvicorn-gunicorn-fastapiython3.7

COPY ./app /app


what i except: call changeResponse param is 7, get response for 7, call changeResponse param is 8, get response for 8. what i get: call changeResponse param is 7, get reponse for 7, call changeReponse 8, sometime the response is 7, sometime is 8, impossible to predict

Continue reading...