v7.0.0 is a complete rewrite of wstunnel in Rust and is not compatible with previous version. Previous code in Haskell can be found on branch https://github.com/erebe/wstunnel/tree/haskell What to expect from previous version: More throughput and less jitter due to Haskell GC. Most of you will not care, as it was performant enough already. But you can now saturate a gigabit ethernet card with a si