tModified of WebRespInfo returns -1 | developer.brewmp.com tModified of WebRespInfo returns -1 | developer.brewmp.com

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tModified of WebRespInfo returns -1

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I checked that HTTP response header has the "Last-Modified: ...." field, but WebRespInfo returns -1 ("Unknown") for the tModified field.

Is there a bug related to this value?
Or did I miss any option setting to get the right value?
How can I get the modification date of the download file?
-sori