I built a server using GraphQL.AspNet and a client using graphql-platform, but subscriptions do not work.

The issue seems to be caused by the ConnectionAck message being sent like this:

{"id":null,"type":"connection_ack"}

I opened PR #8224 in the graphql-platform repository, but the maintainer pointed out that according to the graphql-ws protocol specification, the id field must not be null in a connection_ack message.

I'm not sure which behavior is correct or which side (server or client) should be fixed, so I'm opening this issue for clarification.