Is there a method to check whether a file exists in the cache using its url?

## 💬 Questions and Help

Hi,

I've looked through the documentation, the issues on GitHub and source code.
I'd like to know, using its URL, if a file exists in the cache.

I've only found a private method in the cache manager's `CacheStore`: `_fileExists()`.
But since it's private, I cannot use it.

Any other suggestions?

The issue names CacheStore._fileExists() as the existing private entry point; start by reading that method and the surrounding cache-manager API and documentation. Determine whether URL-based cache existence is already exposed, then clarify the expected public behavior before deciding what change or documentation would make the answer definitive.

Written by the indexing model from the issue text.