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use strict;
use warnings;
...
#    PostData => Variant(VT_UI1, $post_data),
#    Headers  => "Content-Type: application/x-www-form-urlencoded\r\n"
+,
# });

REQUEST_METHOD=POST
CONTENT_LENGTH=71
...
Content length: 71
Content (hex):  7365617263685f666f726d3d2673743d736f636b732673793d7072
+6f6475637473267365617263685f627574746f6e2e783d3339267365617263685f627
+574746f6e2e793d3132
Content:        search_form=&st=socks&sy=products&search_button.x=39&s
+earch_button.y=12