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Could (2017) be added to the title? Since then, Daniel has since rethought this post and is now writing a Rust backend for curl: https://daniel.haxx.se/blog/2020/10/09/rust-in-curl-with-hyp...

this is a frontend, not a rewrite

You mean a backend?

Thank you for the link. In which Daniel Stenberg says: "A rewrite of curl to another language is not considered".

I'm reading it as saying it's not considered because it's a massive task and difficult to get it right, not because it wouldn't be worth doing.

In this case, that’s pretty much the definition of “not worth doing”.