expires can be 0 so manage this case (easily for now)

[olamy]

See https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Expires

The PR is just looking at the 0 value for the header but doesn't look at values of Cache-Control.
If you think it's needed let me know and I can add it but due to the nature of such file I found this a bit complicated for no real added value.

Signed-off-by: Olivier Lamy olamy@apache.org

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