Suggest an alternative to

engine-io

A Haskell server implementation of the Engine.IO and Socket.IO (1.0) protocols

Why do you think that https://github.com/pixbi/duplo is a good alternative to engine-io

A URL to the alternative repo (e.g. GitHub, GitLab)

Here you can share your experience with the project you are suggesting or its comparison with engine-io. Optional.

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