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kotlinlang

Hello,
I successfully configured subscriptions to work on server using `graphql-kotlin-ktor-server` lib, and I get the updates successfully in graphiql console.
 but when I try to use subscriptions on client using apollo client, I don't get any data
I tried using both `<ws://localhost:4000/graphql>` and `<ws://localhost:4000/subscriptions>`
when I try to connect using  `wscat -c <ws://localhost:4000/subscriptions>` I get `error: Unexpected server response: 400`

I have followed this <https://www.apollographql.com/tutorials/apollo-kotlin-android-part2/08-subscriptions> with no success.