Does thegraph support graphql subscriptions?

Im currently using graphql to fetch data using simple queries, but now I would like to subscribe to some data.
I’ve saw this article on messari about using thegraph subscriptions, but when I try it in my nodejs script I get:
Only HTTP(S) protocols are supported
So my question is, does thegraph support graphql subscriptions?
This is my code:

require('cross-fetch/polyfill');
const ApolloClient = require('@apollo/client').ApolloClient;
const InMemoryCache = require('@apollo/client').InMemoryCache;
const gql = require("graphql-tag");

const WSURL = "wss://api.thegraph.com/subgraphs/name/uniswap/uniswap-v3";

const subscription = `
subscription swaps{
  swaps {
    id
    timestamp
  }
}`;

const client = new ApolloClient({  
  uri: WSURL,
  options: {
    reconnect: true
  },  
  cache: new InMemoryCache()
});

client.subscribe({
  query: gql(subscription),
}).subscribe({
  next(data) {
    console.log(data);
  },
  error(err) { console.error('err', err); },
});