Use session with wkhtmltopdf

wkhtmltopdf.sh

wget --save-cookies cookies.txt --keep-session-cookies  http://my-site.dev/app_dev.php/my/page

# It's possible to add option "--post-data 'user=foo&password=bar' " if you need to
# log in for exemple
# Then retrieve the session ID in cookie.txt

vendor/h4cc/wkhtmltopdf-amd64/bin/wkhtmltopdf-amd64                                \
    --cookie 'sessionid' 'gfou6ks1lsguuvtk9il2v169n7'                              \
    --cookie 'PHPSESSID' 'gfou6ks1lsguuvtk9il2v169n7'                              \
    --debug-javascript                                                             \
    --load-error-handling ignore                                                   \
    --post myform[item][size] xl                                                   \
    --post myform[item][color] black                                               \
    --post myform[item][quantity] 1                                                \
    --post myform[_token] 2O-7Y9_jY6v46dunWno9vdaXJZw5hDiBdudiOegiCa8              \
    http://my-site.dev/app_dev.php/my/second/page                                  \
    test.pdf