How can I test a cache rule?

I have a cache rule that all URIs that start with /static/ and have a 2xx response code should have a 1 year cache. However, despite purging my cache, I am receiving a Cache-Control: max-age=600 header instead of the expected 1 year.

I'm unsure if it's as simple as the URI path match being inaccurate, but I have no way of testing that the expected paths match.

The origin is hosted on GitHub Pages, where max-age=600 is the origin's Cache-Control header.
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