[curlinfo_filetime] is used together with [curl->get]. It is used to receive the remote time of the retrieved document (in number of seconds since January 1, 1970 in the GMT/UTC time zone). If you receive -1, then it is likely that the server does not support the option.
The date is given in seconds since January 1, 1970.
local(c = curl('ftp://ftp.sunet.se/pub/etext/gutenberg/GUTINDEX.00.txt')) #c->set(curlopt_filetime, 1) local(result = #c->result) #c->get(curlinfo_filetime)
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