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Open sourcing Pingora: Our Rust framework for building programmable network services
(blog.cloudflare.com)
Welcome to the Rust community! This is a place to discuss about the Rust programming language.
Credits
My guess is that the relevant keyword for the choice of OpenSSL is FIPS. Rusttls doesn't (or at least didn't) have that certification, which matters if you are dealing with US government (directly or indirectly). I believe there is an alternative backend (instead of ring) these days that does have FIPS though.