* use etag header for previews
* use unix millis rather than tz-dependant string
(cherry picked from commit 644503f5e6)
Co-authored-by: Artur Wierzbicki <wierzbicki.artur.94@gmail.com>
* use etag header for previews
* use unix millis rather than tz-dependant string
(cherry picked from commit 644503f5e6)
Co-authored-by: Artur Wierzbicki <wierzbicki.artur.94@gmail.com>