Using Apollo subscriptions for first time so could easily be kotlinlang #apollo-kotlin

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John O'Reilly

01/20/2022, 9:39 PM

Using Apollo subscriptions for first time so could easily be issue on my side but am getting

java.net.ProtocolException: Expected HTTP 101 response but was '404 Not Found

for some reason even though subscription seems to work in playground....more in thread....

I've hosted graphql backend at https://peopleinspace-graphql-guhrsfr7ka-uc.a.run.app/playground which supports for example

subscription {
  issPosition {
    latitude
    longitude
  }
}

and calling following (in shared KMP code)

override fun pollISSPosition(): Flow<IssPosition> {
        return apolloClient.subscription(IssPositionSubscription()).toFlow().map {
            val result = it.dataAssertNoErrors.issPosition
            IssPosition(result.latitude, result.longitude)
        }
    }

have pushed changes made so far to following branch....error occurs when for example clicking map option in android client https://github.com/joreilly/PeopleInSpace/tree/graphql_client

and this is what I see in playground

I'll keep digging but just in case any particular things to look out for

bod

01/20/2022, 9:52 PM

maybe it’s a matter of setting

webSocketServerUrl

but not sure what the right value needs to be

John O'Reilly

01/20/2022, 9:54 PM

ah, didn't realise that needed to be set....let me try setting it

bod

01/20/2022, 9:54 PM

I think

<wss://peopleinspace-graphql-guhrsfr7ka-uc.a.run.app/subscriptions>

John O'Reilly

01/20/2022, 9:56 PM

that was it, thanks!

also just updated that branch with the change

bod

01/20/2022, 9:57 PM

yay 🎉

John O'Reilly

01/21/2022, 8:35 AM

btw feel free if you want to use this as an example of public graphql backend that supports subscriptions.....hopefully won't cost too much to run and I have yearly google cloud credits which I haven't been putting to use anyway 🙂

bod

01/21/2022, 8:36 AM

very cool 🙏 That could prove useful 😄

John O'Reilly

01/21/2022, 8:38 AM

I ended up creating new repo for the source for it https://github.com/joreilly/PeopleInSpaceGraphQLServer

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