我有两个项目要停靠，我怀疑nginx端口转发之间有问题，我在这个问题上是新手，Dockefile如下：

//Dockerfile NodeJS(后台)

FROM alpine as node-build
RUN apk add --update nodejs npm
WORKDIR /app
COPY . .
RUN npm install

CMD [ "node", "server.js" ]

//DockerfileAngular (前端)

FROM node:16-alpine as frontend
WORKDIR /app
COPY . .
RUN npm install
RUN npm run frontend

FROM nginx:alpine
COPY --from=frontend /app/dist/frontend /usr/share/nginx/html

//Docker Compose

version: '2.0'
services:
  backend:
    build:
      context: './backend'
    ports:
    - "3000:3000"
  frontend:
    build:
      context: './frontend'
    ports:
    - "4200:80"

//前端代理(/Fronend/proxy.config.json)

{
  "/enviroment/*":{
    "target": "http://localhost:3000",
    "secure": false,
    "loglevel": "debug"
  }
}

我怎么才能让他们之间进行交流呢？