Real time subscription chapter for graphql-node tutorial needs update

Hi, first, thanks for making these tutorials.

I tried to follow the real time chapter of graphql-node: rhttps://www.howtographql.com/graphql-js/7-subscriptions/, and found that Apollo v3 has removed its built-in support for real time server: https://www.apollographql.com/docs/apollo-server/data/subscriptions/#enabling-subscriptions

I tried to adapt the tutorial to the new approach described in the doc, but couldn't make it work. It cannot establish a connection, and I can't find any meaningful errors for debug.

• I wonder if Apollo v3 is recommended?
• What is the recommended approach for building real time subscriptions?
• Could you update this chapter, or provide a working example?

Thank you.