Can't get express-gateway to work with docker compose

Hi,

I am dealing with the following scenario:

• I have an authentication API
• I have an API that connects to a database
• I have an express-gateway API to handle rate limiting to the database API

The logic is as follows: go to localhost:3000/login (auth-api), login using Auth0, the user is then redirected to the gateway at localhost:8081, the gateway then rate limits and proxies the request to localhost:8000/path/to/data (database API)

Everything works correctly locally. However, now that I am trying to tie everything together using Docker compose. I keep receiving a Bad Gateway error when the gateway is supposed to redirect to the database API. I have included the code that redirects to the gateway, the docker-compose.yml file and the gateway.config.yml file to provide more context.

Database API Redirect

res.redirect('http://gateway:8081/path/to/data?token=' + req.query.code);

Gateway Config File

admin:
  port: 9876
  hostname: localhost
http:
  port: 8081
apiEndpoints:
  orders:
    host: 'gateway' # I have also tried to make this *, localhost and datasets-api and I have removed it completely
    paths:
      - '/path/to/data'
      # - '/'
      # - '*'
serviceEndpoints:
  orders:
    url:  'http://datasets-api:8000' # I have also tried to make this localhost
policies:
  - proxy
  - rate-limit
  - expression
pipelines:
  orders:
    apiEndpoints:
      - orders
    policies:
      - expression:
        - action:
            jscode: "
            "
      - rate-limit:
        - action:
            max: 5
            windowMs: 60000
      - proxy:
          - action:
              serviceEndpoint: orders
              changeOrigin: true # I have also tried this as false

Docker Compose File

version: '3'
services:
  dw-db:
    image: "centos/postgresql-95-centos7"
    environment:
      - POSTGRESQL_USER=admin
      - POSTGRESQL_PASSWORD=password
      - POSTGRESQL_DATABASE=db
    ports:
      - "6000:5432"
  datasets-api:
    build: "./datasets"
    hostname: datasets-api
    ports:
      - "8000:8000"
    environment:
      - HOSTNAME=datasets-api
      - CONFIG_PATH=/usr/src/app/server/config/config.json
    volumes:
      - $PWD/datasets:/usr/src/app
    depends_on:
      - dw-db
    links:
      - dw-db
    tty: true
  gateway:
    build: "./gateway"
    hostname: gateway
    environment:
      - HOSTNAME=gateway
    ports:
      - "8081:8081"
      - "9876:9876"
    depends_on:
      - datasets-api
    links:
      - datasets-api

  auth-api:
    build: "./gateway/auth-api"
    hostname: auth-api
    ports:
      - "3000:3000"
    environment:
      - HOSTNAME=auth-api
      - SERVICE_ENDPOINT=http://gateway:8081 # I have also tried to make this localhost but it makes no difference
    links:
      - gateway
    depends_on:
      - gateway

I have also submitted the issue on Gitter. Please could someone assist me with this?

Thanks in advance!

[fabiosoft]

Removed all hostnames and works perfectly! 👍

[EdwinSilvaDK]

I have the same issue but in swam mode ?