WeidiDeng 22563a70eb
file_server: use the UTC timezone for modified time (#6830)
* use UTC timezone for modified time

* use http.ParseTime to handle If-Modified-Since

* use time.Compare to simplify comparison

* take the directory's modtime into consideration when calculating lastModified

* update comments about If-Modified-Since's handling
2025-02-10 08:39:43 -07:00
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