Express Gateway Example with Multiple Services

backends.js

const express = require('express');

const forum = express();

forum
  .get('/healthz', (req, res, next) => {
    res.send({ name: 'forum', status: 'healthy' });
    next();
  })
  .get('/d/:id', (req, res, next) => {
    res.send({ discussion: req.params.id });
    next();
  })
  .listen(process.env.PORT || 1337);

const members = express();

members
  .get('/', (req, res, next) => {
    res.send({ members: [ { name: 'gary', avatar: 'snail' }] });
    next();
  })
  .listen(process.env.PORT2 || 1338);

gateway.config.yml

http:
  port: 8080
admin:
  port: 9876
  hostname: localhost
apiEndpoints:
  forumAPI:
    host: 'forum.example.com'
    paths:
      - '/discussions/*'
      - '/healthz'
  membersAPI:
    host: 'members.example.com'
serviceEndpoints:
  forumService:
    url: 'http://localhost:1337'
  membersService:
    url: 'http://localhost:1338'
policies:
  - expression
  - key-auth
  - proxy
pipelines:
  - name: forum
    apiEndpoints:
      - forumAPI
    policies:
      - expression:
        - action:
            jscode: |
              if (req.url.startsWith('/discussions')) {
                const slug = req.url.substr('/discussions'.length);
                req.url = '/d' + slug;
              }
      - proxy:
        - action:
            serviceEndpoint: forumService
  - name: members
    apiEndpoints:
      - membersAPI
    policies:
      - key-auth:
      - proxy:
        - action:
            serviceEndpoint: membersService

Note: Append the following to your /etc/hosts file:

127.0.0.1                forum.example.com
127.0.0.1                members.example.com

Testing forumAPI healthcheck:

$ curl -i -H "Host: forum.example.com" http://localhost:8080/healthz
HTTP/1.1 200 OK
x-powered-by: Express
content-type: application/json; charset=utf-8
content-length: 35
etag: W/"23-oI8lro08GsI4wRbkbqIMZn3a0nY"
date: Fri, 04 Aug 2017 22:31:08 GMT
connection: close

{"name":"forum","status":"healthy"}                                                   

Testing forumAPI discussions:

$ curl -i -H "Host: forum.example.com" http://localhost:8080/discussions/nodejs
HTTP/1.1 200 OK
x-powered-by: Express
content-type: application/json; charset=utf-8
content-length: 23
etag: W/"17-aGi2PapXcBJJzJGz6x1KK0JP+WQ"
date: Fri, 04 Aug 2017 23:14:42 GMT
connection: close

{"discussion":"nodejs"}

Testing membersAPI root:

$ curl -i -H "Host: members.example.com" http://localhost:8080/
HTTP/1.1 401 Unauthorized
X-Powered-By: Express
Content-Type: text/html; charset=utf-8
Content-Length: 9
ETag: W/"9-PatfYBLj4Um1qTm5zrukoLhNyPU"
Date: Fri, 04 Aug 2017 22:31:12 GMT
Connection: keep-alive

Forbidden

Testing membersAPI root with authorization:

$ curl -i -H "Host: members.example.com" -H "Authorization: APIKey $APIKEY" http://localhost:8080/
HTTP/1.1 200 OK
x-powered-by: Express
content-type: application/json; charset=utf-8
content-length: 46
etag: W/"2e-O6rO+xob/EVDxdaV4yvvnL61o1Y"
date: Fri, 04 Aug 2017 23:25:28 GMT
connection: close

{"members":[{"name":"gary","avatar":"snail"}]}

Hi, thanks for the gist, can we set up to send a request without a host header? (Also many pipelines)

If you have in members service the same "/healthz" route, how did you route it then in express-gateay?