What backend platform is Opa running on?

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I wonder what backend platform Opa is using for communication with the browsers.

My guess would be Node.js.

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Opa has his own application server. No extra application is needed.

We have our own scheduler handling both networks events and client computations (we use cooperative threads). We wrote a protocol specific language and built an http server with it.

Have a look at the compiler source code (check appruntime/ and libnet/ for scheduler and networks libs) : https://github.com/MLstate/opalang

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Opa has switched its default backend platform to Node.js.