nginx.conf

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events {}
http {
  upstream api  { server api:8034; }
  upstream web { server web:80; }

  server {
    listen 80;

    # Pure API calls
    location /api/ {
      proxy_pass         http://api;
      proxy_set_header   Host $host;
      proxy_set_header   X-Real-IP $remote_addr;
      # Replace the client's X-Forwarded-For: the api trusts this gateway's header
      proxy_set_header   X-Forwarded-For $remote_addr;
    }

    # Remote probes (the probe protocol). A compressed results batch can be a little over
    # 1 MiB, which is more than nginx's default client_max_body_size of 1m allows.
    location /probe/ {
      client_max_body_size 2m;
      proxy_pass         http://api;
      proxy_set_header   Host $host;
      proxy_set_header   X-Real-IP $remote_addr;
      # Replace the client's X-Forwarded-For: the api trusts this gateway's header
      proxy_set_header   X-Forwarded-For $remote_addr;
    }

    # socket.io
    location /socket.io/ {
      proxy_pass http://api;
      proxy_set_header Host $host;
      proxy_set_header X-Real-IP $remote_addr;
      proxy_set_header X-Forwarded-For $remote_addr;
      proxy_set_header Upgrade $http_upgrade;
      proxy_set_header Connection "upgrade";
    }

    # Everything else → static SPA
    location / {
      proxy_pass http://web;
    }
  }
}