.csv is cached despite page rule

[ramin.esfandiari]

I have a page Rule on a url example.com/*.csv that sets Cache Level to Bypass.

However when I call my endpoint with a .csv at the end it still caches every call succeeding the first call.
example.com/xxx/xxx/somefile.csv

When I call without the .csv, it then works as expected (hits my server) every time
example.com/xxx/xxx/somefile

Is there anyway to make sure calling with .csv at the end of URL will not return a cache result?

Thanks

[TomKlein]

Did you purge the cache after creating the page rule?

[ramin.esfandiari]

I did purge all cache. But still no luck.

[ramin.esfandiari]

Found the issue.

We had the following in our worker:

request = new Request(event.request);
var response = await fetch(source, request);

fetch was caching but this was not appearing on the Cloudflare Caching Status dashboard nor we were getting a CF-Cache-status header back which all indicated that no caching was taking place on the Cloudflare. It was quite baffling.

Setting the cache ttl to 0 solved the issue:

request = new Request(event.request, {cf: {cacheTtl: 0}});
var response = await fetch(source, request);