Minimal Example of Caching Reverse Proxy for One URL?

[Steve Williams <sbw@xxxxxxx>]

Can anyone point me to a minimal example of configuring a reverse proxy 
for a single .js URL, where the local server caches the Javascript file 
and serves it with appropriate headers, like Expires, Last-Modified, 
Cache-Control, etc., and maybe even a 304 response if the request 
includes If-Modified-Since?

My use case: I use plausible.io for privacy-respecting web stats. 
Plausible discusses the need to proxy their Javascript here:

https://plausible.io/docs/proxy/introduction

Here's what I have so far, in my VirtualHost:

    SSLProxyEngine on
    ProxyPass "/api/event" "https://plausible.io/api/event";
    ProxyPass "/p.js" "https://plausible.io/js/plausible.js";

That's working on my web site, but always serving a fresh copy of the 
Javascript:

https://ony.ms/

I've read some cookbook articles on reverse proxies and caching with 
Apache, including:

https://httpd.apache.org/docs/2.4/howto/reverse_proxy.html

https://taylor.callsen.me/creating-a-caching-proxy-server-with-apache/

But I want to proxy and cache only this one location.  I've read a lot 
of the Apache documentation on mod_proxy and mod_cache, but it would 
take much time to really understand it.

I hope someone here can give me a cookbook example I can learn from!

Thanks!

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