Handling of the WebSocket's init-payload

When executing GraphQL operations over WebSockets (both with the graphql-ws and graphql-transport-ws protocols), the client can send an initial payload to the server when establishing the WebSocket connection. This payload can contain any information that the server might need to process GraphQL requests, like client agent identification (similar to the User-Agent header) or data specific to the client. On the server-side, you can access this payload via the GraphQLContext, which is available through the DataFetchingEnvironment object.

@GraphQLApi
public class HeroResources {

    @Inject
    SmallryeContext context;

    // ... 
        Map<String, Object> initPayload = smallRyeContext
            .getDataFetchingEnvironment()
            .getGraphQlContext()
            .get("init-payload");
    // ...
}