Implementing Request Routing

routes:
  - paths: ["/health"]
    service: health-svc
  - paths: ["/metrics"]
    service: metrics-svc

routes:
  - paths: ["/users"]   service: users-svc
  - paths: ["/orders"]  service: orders-svc
  - paths: ["/billing"] service: billing-svc

routes:
  - paths: ["/api"]
    headers:
      X-Tenant-Tier: ["premium"]
    service: premium-cluster
  - paths: ["/api"]
    service: standard-cluster

routes:
  - hosts: ["acme.app.com"]   service: acme-svc
  - hosts: ["globex.app.com"] service: globex-svc
  - hosts: ["*.app.com"]      service: default-svc

local jwt = require "kong.plugins.jwt.jwt_parser"
local token = kong.request.get_header("authorization"):sub(8)
local payload = jwt:new(token):get_payload()
local shard = payload.tenant_shard or "default"
kong.service.set_target("shard-" .. shard .. ".internal", 8080)

upstreams:
  - name: checkout-pool
    targets:
      - target: checkout-stable:8080
        weight: 90
      - target: checkout-new:8080
        weight: 10

geoip2 /etc/geoip2/GeoLite2-Country.mmdb {
  $geoip_country_code source=$remote_addr country iso_code;
}
map $geoip_country_code $backend {
  default       us-cluster.internal;
  ~^(DE|FR|IT|ES) eu-cluster.internal;
  ~^(JP|KR|SG)  apac-cluster.internal;
}
location / { proxy_pass http://$backend; }