Using Apollo subscriptions for first time so could...

# apollo-kotlin

[John O'Reilly]

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....

[John O'Reilly]

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

which supports for example

subscription {
  issPosition {
    latitude
    longitude
  }
}

[John O'Reilly]

and calling following (in shared KMP code)

[John O'Reilly]

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

[John O'Reilly]

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

[John O'Reilly]

and this is what I see in playground

[John O'Reilly]

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

[bod]

maybe it’s a matter of setting webSocketServerUrl but not sure what the right value needs to be

[John O'Reilly]

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

[bod]

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

[John O'Reilly]

that was it, thanks!

[John O'Reilly]

also just updated that branch with the change

[bod]

yay 🎉

[John O'Reilly]

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]

very cool 🙏 That could prove useful 😄

[John O'Reilly]

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