docker-compose up -d

curl -i "http://127.0.0.1:9180/apisix/admin/routes" -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
{
  "id": "getting-started-ip",
  "uri": "/ip",
  "upstream": {
    "type": "roundrobin",
    "nodes": {
      "httpbin.org:80": 1
    }
  }
}'

curl "http://127.0.0.1:9080/ip"

{
  "origin": "172.18.0.1, 103.155.219.47"
}

curl -i "http://127.0.0.1:9180/apisix/admin/routes" -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
{
  "id": "getting-started-headers",
  "uri": "/headers",
  "upstream" : {
    "type": "roundrobin",
    "nodes": {
      "httpbin.org:443": 1,
      "mock.api7.ai:443": 1
    },
    "pass_host": "node",
    "scheme": "https"
  }
}'

hc=$(seq 100 | xargs -I {} curl "http://127.0.0.1:9080/headers" -sL | grep "httpbin" | wc -l); echo httpbin.org: $hc, mock.api7.ai: $((100 - $hc))

httpbin.org: 49, mock.api7.ai: 51