I found that there is a red command to download contents of a web page:
read https://trello.com/c/8p75OiSE/26-test-card.json
However, I have two problems (at least on Linux Mint):
- Trello's response differs for this request than it does for simply visiting this URL in a web browser (try it! it works fine in a browser).
- If I did need to add authorization headers (shouldn't for this public card), I don't see a way to do that.
It is even worse in Tio.run, but I'm pretty sure that is not a problem with the language itself but with Tio.run.