├── api
│   └── public
│       └── rest
├── app.yaml
├── composer.json
└── public
    ├── app1
    └── app2

runtime: php
env: flex

runtime_config:
  document_root: public
  enable_stackdriver_integration: true

server {
    location ^~ /api/ {
        alias /api/public/;
    }

    location ^~ /api/rest/ {
        try_files $uri /routes.php;
    }
}