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haskellservant

Servant Server Sent Events support

How do I define a Server-Sent Event(SSE) end point for servant. The docs don't seem to cover this case.

If Servant is not designed for the realtime use case, which Haskell server framework supports SSE?

Solution

  • servant uses WAI, and you can always dip down into normal WAI applications and all the libraries that exist for it with the Raw combinator. So you can use Network.Wai.EventSource from wai-extra to create an Application, which is the type of handlers for Raw endpoints. Something like:

    type MyApi = "normalapi" :> NormalApi 
        :<|> "sse" :> Raw

myServer :: Server MyAPI
myServer = normalServer :<|> eventSourceAppChan myChan