nginx.conf

server {
    listen 80 default_server;
    listen [::]:80 default_server;

    root /var/www/app/frontend/build;
    index index.html;

    server_name _;

    error_page 502 /502.json;
    location /502.json {
            return 502 '{"http_code":502,"message":"Bad Gateway (backend down)","meta":{"commit_hash":"nginx","version":"nginx"},"response":{},"status":false}';
    }

    error_page 503 /503.json;
    location /503.json {
            return 503 '{"http_code":503,"message":"Service Temporarily Unavailable (too many requests, rate limit)","meta":{"commit_hash":"nginx","version":"nginx"},"response":{},"status":false}';
    }

    error_page 429 /429.json;
    location /429.json {
            return 429 '{"http_code":429,"message":"Too many requests. You are being rate limited!","meta":{"commit_hash":"nginx","version":"nginx"},"response":{},"status":false}';
    }

    location /api {
        proxy_pass http://127.0.0.1:5000;
        proxy_redirect off;

        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header Host $host;
        proxy_set_header X-Forwarded-Proto $scheme;
    }
}