server {
  listen 3000;
  server_name _;

  root /usr/share/nginx/html;
  index index.html;

  # Long cache for fingerprinted Next assets
  location /_next/static/ {
    expires 1y;
    add_header Cache-Control "public, immutable";
    try_files $uri =404;
  }

  # Proxy API calls to the Go service.
  # `flow` is the service name on the docker-compose network.
  location /api/ {
    proxy_pass http://flow:8090;
    proxy_http_version 1.1;
    proxy_set_header Host $host;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header X-Forwarded-Proto $scheme;
    proxy_read_timeout 120s;
  }

  # Next static export uses trailingSlash=true; map directory paths to
  # their index.html. Try the requested URI, then the directory, then the
  # 404 page (Next's _not-found export).
  location / {
    try_files $uri $uri/ $uri.html $uri/index.html /index.html =404;
  }

  # Don't log the favicon nag
  location = /favicon.ico { log_not_found off; access_log off; }
}