Reqwest GET https unable to get local issuer certificate

I am fetch https://www.rte-france.com/themes/swi/xml/power-co2-emission-fr.xml?_= with reqwest crates, and I have following error message

unable to get local issuer certificate

same error when doing a curl.

However, all parents certificates seems present in my Ubuntu :

$ ls -lisa /etc/ssl/certs/Glo*
7211313 4 lrwxrwxrwx 1 root root 66 mai    3 14:29 /etc/ssl/certs/GlobalSign_ECC_Root_CA_-_R4.pem -> /usr/share/ca-certificates/mozilla/GlobalSign_ECC_Root_CA_-_R4.crt
7211314 4 lrwxrwxrwx 1 root root 66 mai    3 14:29 /etc/ssl/certs/GlobalSign_ECC_Root_CA_-_R5.pem -> /usr/share/ca-certificates/mozilla/GlobalSign_ECC_Root_CA_-_R5.crt
7211315 0 lrwxrwxrwx 1 root root 57 mai    3 14:29 /etc/ssl/certs/GlobalSign_Root_CA.pem -> /usr/share/ca-certificates/mozilla/GlobalSign_Root_CA.crt
7211316 4 lrwxrwxrwx 1 root root 62 mai    3 14:29 /etc/ssl/certs/GlobalSign_Root_CA_-_R2.pem -> /usr/share/ca-certificates/mozilla/GlobalSign_Root_CA_-_R2.crt
7211317 4 lrwxrwxrwx 1 root root 62 mai    3 14:29 /etc/ssl/certs/GlobalSign_Root_CA_-_R3.pem -> /usr/share/ca-certificates/mozilla/GlobalSign_Root_CA_-_R3.crt
7211318 4 lrwxrwxrwx 1 root root 62 mai    3 14:29 /etc/ssl/certs/GlobalSign_Root_CA_-_R6.pem -> /usr/share/ca-certificates/mozilla/GlobalSign_Root_CA_-_R6.crt
7210927 0 lrwxrwxrwx 1 root root 58 sept. 16 14:28 /etc/ssl/certs/GlobalSign_Root_E46.pem -> /usr/share/ca-certificates/mozilla/GlobalSign_Root_E46.crt
7211286 0 lrwxrwxrwx 1 root root 58 sept. 16 14:28 /etc/ssl/certs/GlobalSign_Root_R46.pem -> /usr/share/ca-certificates/mozilla/GlobalSign_Root_R46.crt

Playground : Rust Playground

I manage to fix the curl command by downloading the web site certificate. Is it normal.

Please advise why my rust code does not work.