Node serve命令返回空响应

Question

我正在构建和托管反应应用程序，运行它的脚本如下：

npm run build;
npm install -g serve
serve -s build

但是当我跑步时，它表示它正在localhost:5000上运行，但当我转到它时它会返回一个空响应。

我是从继承自node image。

的docker容器内运行的

搬运工-compose.yml：

version: '3'

services:
    frontend:
        build: ./frontend
        command: ["./docker_up.sh"]
        restart: always
        volumes:
           - ./frontend:/app/frontend
           - node-modules:/app/frontend/node_modules
        ports:
          - "3000:3000"
          - "5000:5000"
          - "80:80"
          - "443:443"
        environment:
          - MODE=PROD
volumes:
  node-modules:

Dockerfile：

FROM node

WORKDIR /app/frontend
COPY package.json /app/frontend
COPY build/* /usr/share/nginx/html/

RUN npm install

EXPOSE 3000
EXPOSE 5000
EXPOSE 80
EXPOSE 443
CMD ["docker_up.sh"]

docker_up.sh：

#!/bin/bash

if [ $MODE == "PROD" ]; then
    echo "Using production settings.";
    apt-get update;
    apt-get install xsel;
    npm run build;

    npm install -g serve
    serve -s build
else
    echo "Using development settings."
    npm start;
fi;