[THREDDS #GCE-849369]: thredds last-modified header missing

Hi Darren,

I did some digging, and it turns out that we've not been including the 
"Last-Modified" header in any of our "fileServer" responses since v4.3.22. As 
far as I can tell, removal of the header was a mistake, not a deliberate 
decision.

I've submitted a pull request that restores the header [1]. The change will 
appear in THREDDS v5.0.0.

Thanks for the bug report!

-Christian

[1] https://github.com/Unidata/thredds/pull/658

Ticket Details
===================
Ticket ID: GCE-849369
Department: Support THREDDS
Priority: Normal
Status: Closed
===================
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