try 从数据库创建、获取数据时失败(pymongo、MongoDB、dockercompose)

当我try 在我的FASK应用程序中执行GET或POST时，出现以下错误.

Mongo:27017:[Errno-2]名称不能解析(配置的超时: SocketTimeoutMS:20000.0ms，ConnectTimeoutMS:20000.0ms)，超时: 30s，拓Flutter 描述:&lt；拓Flutter 描述ID: 657c619ae1e4696f65e708c2，拓Flutter 图类型:未知，服务器: [&lt；ServerDescription(‘Mongo’，27017)SERVER_TYPE:未知，实时:无， 错误=自动侦测(‘Mongo:27017:[Errno-2]名称未解析 (配置超时:socketTimeoutMS:20000.0ms，ConnectTimeoutMS: 20000.0ms)‘)&gt；]&gt；

我的app.py

from flask import Flask, jsonify
from pymongo import MongoClient
from loguru import logger
from bson.json_util import dumps

app = Flask(__name__)

MONGO_URI = "mongodb://admin:admin@mongo:27017/"

@app.route('/', methods=['GET'])
def get_data():
    try:
        logger.info('Connecting to MongoDB')
        client = MongoClient(MONGO_URI)
        logger.info('Connected to MongoDB')
        db = client.test
        collection = db.test
        data = collection.find({})
        serialized_data = dumps(data)
        logger.info('Data retrieved successfully')
        return jsonify({"data": serialized_data}), 200
    except Exception as e:
        return jsonify({"error": f"{str(e)}"}), 500

@app.route('/', methods=['POST'])
def create_data():
    try:
        logger.info('Connecting to MongoDB')
        client = MongoClient(MONGO_URI)
        logger.info('Connected to MongoDB')
        db = client.test
        collection = db.test
        data = collection.insert_one({"name": "test"})
        logger.info('Data created successfully')
        return jsonify({"data": data}), 200
    except Exception as e:
        return jsonify({"error": f"{str(e)}"}), 500

if __name__ == '__main__':
    app.run(host='0.0.0.0')

Docker-作文

version: '3.9'

services:
  web:
    build:
      context: .
      dockerfile: Dockerfile
    ports:
      - "5000:5000"
    depends_on:
      - mongodb
      - nginx

  nginx:
    image: nginx:latest
    ports:
      - "80:80"
    volumes:
      - ./nginx.conf:/etc/nginx/nginx.conf:ro

  mongodb:
    image: mongo:latest
    ports:
      - "27017:27017"
    environment:
      - MONGO_INITDB_DATABASE=test
      - MONGO_INITDB_ROOT_USERNAME=admin
      - MONGO_INITDB_ROOT_PASSWORD=admin
      - MONGO_URI=mongodb://admin:admin@mongodb:27017/test
    volumes:
      - mongodb_data:/data/db

volumes:
  mongodb_data:

表示存在连接错误的错误对我来说没有多大意义，因为生成的日志(log)显示请求通过连接线.

有谁知道怎么解这个题吗？