How to use nginx to give a file whose name is generated by a script?

Question

Nginx

I do CNC . I would like nginx to do rewrite not based on the regular expression from the config, but based on the result of the script.
Like something like this:

location /products {
    proxy_pass localhost:1234/getProductFileName.js
    rewrite ^(.*)$ proxy_pass_result
}

For example:

1. Request for /products/primer .
   
2. Nginx goes to localhost:1234/getProductFileName.js?primer .
   
3. The script responds to nginx (in body or header) with the line: /products/grunt.html
   
4. Nginx does a rewrite and returns /products/grunt.html (at the original address in the browser /products/grunt )
   

Of course, I can give the script the file itself (or empty html with the ssi include directive). But firstly, I want unification (so that files are given only to nginx, without the zoo), if possible. Secondly, I want standard nginx 404 errors if the file does not exist.

Answer 1

Header "X-Accel-Redirect".