The code I am writing now is as follows, but it doesn’t work.
Do you need to write rewrite rules, use regular expressions, or if?

And: If you configure the static file directory in nodejs, app.use(express.static(__dirname));In this way, will the performance be lower than nginx's direct judgment and processing?

server {
        listen 80;
        server_name xxx.wechattest.com;
        root /path/to/static/root;
        index index.html;
        
        location / {

                proxy_pass http://127.0.0.1:9999;//nodejs service is running on port 9999

                proxy_set_header X-Real-IP $remote_addr;
                proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

                client_max_body_size 100M;
                client_body_buffer_size 1m;
                proxy_intercept_errors on;
                proxy_buffering off;
                proxy_buffer_size 128k;
                proxy_buffers 256 16k;
                proxy_busy_buffers_size 256k;
                proxy_temp_file_write_size 256k;
                proxy_max_temp_file_size 0;
                proxy_read_timeout 300;
        }
}