curl --insecure --verbose 'https://captiveportal-login.univ-st-etienne.fr/cgi-bin/login' --compressed -H 'Content-Type: application/x-www-form-urlencoded' --data 'user=rmll_ewv&password=w2xIsylh9W&cmd=authenticate&Login=Log+In'
script logon to the awful captive portal on UJM-Invite at #RMLL2017.
cc @bortzmeyer