Can't see the address when nginx processes the port and outputs 502 Bad Gateway-CodePudding

I encountered a problem when learning nginx. I have 2 servers on 2 different ports. I want a page with information stored on port 8000 to be returned when accessing "http://localhost/api/v1/clients/". Now I get error 502 Bad Gateway. В консоли: connect() failed (111: Connection refused) while connecting to upstream, client: 111.11.0.1, server: localhost, request: "GET /api/v1/clients/ HTTP/1.1", upstream: "http://111.11.0.2:80/api/v1/clients/", host: "localhost" If I go to the address: "http://localhost:8000/api/v1/clients/", everything is fine. What's my mistake?

nginx:

upstream backend {
    server 127.0.0.1:8000;
    server 127.0.0.1:3000;
}

server {
    listen 80;
    server_name localhost;

    location /api/v1/clients/ {
        proxy_pass http://backend_client/api/v1/clients/; 
    }
}

docker:

services:
  backend_client:
    build: ./Client
    volumes:
      - ./Client/:/app
    ports:
      - "8000:8000"
    restart: always
    command:
      "gunicorn --bind=0.0.0.0:8000 django_app.wsgi"
  nginx:
    image: nginx:1.17
    container_name: ngx
    ports:
      - "80:80"
    volumes:
      - ./nginx:/etc/nginx/conf.d
    depends_on:
      - backend_client

CodePudding user response：

Change your NGINX Configuration. Make sure you are reading some basic information about

NGINX config upstreams
NGINX config reverse proxy

Your backend will be available as backend_client in your nginx container. The upstream is backend. Your app is still listing on port 8000 and this information is important. So tell NGINX about it :).

upstream backend {
    server backend_client:8000;
}

server {
    listen 80;

    location /api/v1/clients/ {
        proxy_pass http://backend/; 
    }
}