Uri with ':' inside it are misinterpreted.

[lowlevl]

let data = await r2('https://bibliotheques-specialisees.paris.fr/ark:/73873/pf0000855431/0001/v0001.simple.selectedTab=otherdocs').text;
console.log(data);

outputs nothing because the : is misinterpreted as a port marker, when it's not a port, but

let data = await r2('https://bibliotheques-specialisees.paris.fr/ark\\:/73873/pf0000855431/0001/v0001.simple.selectedTab=otherdocs').text;
console.log(data);

works.

Furthermore the Promise resolves correctly but with an empty .text, thus leaving us without a way to handle it.