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"Unknown host" error calling containerized backend from frontend（1个答案）
26天前关闭。
我在写一个应用程序。我写.net作为后端，Angular作为前端。对接的时候，我把我的前端应用程序放在nginx里面。Dockerfile是这样的

FROM node:20.10-alpine AS build
WORKDIR /app
COPY package*.json .
RUN npm install
RUN npx ngcc --properties es2023 browser module main --first-only --create-ivy-entry-points
COPY . .
RUN npm run build --prod
FROM nginx:stable
COPY --from=build /app/dist/librari-fy/ /usr/share/nginx/html
COPY nginx.conf /etc/nginx/nginx.conf
EXPOSE 80

字符串
nginx.conf如下：

worker_processes 1;
events {
    worker_connections 1024;
}
http {
    server {
        listen 80;
        server_name http://backend:80;
        root /usr/share/nginx/html/browser;
        index index.html index.htm;
        include /etc/nginx/mime.types;
        gzip on;
        gzip_http_version 1.1;
        gzip_disable      "MSIE [1-6]\.";
        gzip_min_length   256;
        gzip_vary         on;
        gzip_proxied      expired no-cache no-store private auth;
        gzip_types        text/plain text/css application/json application/javascript application/x-javascript text/xml application/xml application/xml+rss text/javascript;
        gzip_comp_level   9;
        location / {
            try_files $uri $uri/ /index.html;
            add_header Access-Control-Allow-Origin *;
            add_header 'Access-Control-Allow-Origin' 'http://localhost:4200' always;
        }
    }
}

型
Docker-compose文件：

version: '3.8'
services:
  postgres:
    image: postgres:16-alpine
    container_name: postgredatabase
    restart: always
    environment:
      POSTGRES_PASSWORD: UArA0CGd5y1g5sE7U0OH
      POSTGRES_USER: libraryadmin
      POSTGRES_DB: Library
    ports:
      - "5432:5432"
    volumes:
      - postgres_data:/var/lib/postgresql/data
    networks:
      - app_internal_network
    healthcheck:
      test: pg_isready
      interval: 10s
      timeout: 60s
      retries: 5
      start_period: 80s 
    
  backend:
    image: sahinyakici/librarybackend:latest
    restart: always
    container_name: backend
    depends_on:
      postgres:
        condition: service_healthy
    networks:
      - app_internal_network
    ports:
      - "8080:80"
  frontend:
    container_name: librarify
    image: sahinyakici/librarify:latest
    restart: always
    depends_on:
      - backend
    networks:
      - app_internal_network
    ports:
      - 80:80
    expose:
      - 80
volumes:
  postgres_data:
networks:
  app_internal_network:
    driver: bridge

型
应用程序运行成功，但我在网站的控制台中得到以下错误：“Failed to load resource：net：：ERR_NAME_NOT_RESOLVED”。如果我进入UI容器并尝试使用curl，我可以从后端获取数据。您认为是什么问题？
Error screenshotError2Error3
我试着从容器中使用 curl 。