I used "httrack --catchurl" to generate a POST request file "hts-post0", and
then issued command:

httrack <http://path?query?>postfile:hts-post0">;

but the request times out (error -2).  Are there any diagnostics available?
More data:  I'm using httrack from Debian stable, HTTrack version 3.40-2. 
catchurl output seems to be fine.  In fact, I ran "wget -postfile=hts-post0"
successfully (up to javascript, of course).