server {
    listen 80;
    server_name _;
    root /usr/share/nginx/html;
    index index.html;

    # Receipt photo uploads can be sizeable.
    client_max_body_size 20m;

    location /api/ {
        proxy_pass http://backend:5000;
        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;
    }

    location /auth/ {
        proxy_pass http://backend:5000;
        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;
    }

    # SPA - anything else falls back to index.html.
    location / {
        try_files $uri /index.html;
    }
}