Feature Idea: Support subscriptions in Apollo-boost

Proposed API:

const client = new ApolloClient({
  uri: 'https://nx9zvp49q7.lp.gql.zone/graphql',
  subscriptionsUri: 'https://nx9zvp49q7.lp.gql.zone/subs',
})

[lfades]

Here’s another proposed API:

const client = new ApolloClient({
  ws: new WebSocketLink({
    uri: 'ws://...',
    options: {
      reconnect: true
    }
  })
})

This way configs for WebSocketLink are handled outside of apollo-boost and no more dependencies are needed, when doing SSR (or using something like Next.js) the above will fail cause WebSocketLink will throw an error, so it may also take a function that returns the link and is only called client side

const client = new ApolloClient({
  ws: () => new WebSocketLink({ ... })
})

I will be happy to do a PR, it’s ready 💃

[lfades]

Currently apollo-boost doesn’t has subscriptions