not finding websocket with subscriptions

Writing a simple chat application using apollo and express. Prior to this I was using subscriptions-transport-ws and graphql-server-express but there was an issue with graphiql not being able to call subscriptions due to a client error with graphiql. Because of this issue, I swapped over to apollo.

Currently, when I try to access a subscription through graphiql the client comes back and says: "Could not connect to websocket endpoint ws://localhost:6001/graphql. Please check if the endpoint url is correct." If I try to use a simple websocket client to find the websocket endpoint, it doesn’t seem to exist.

I stripped out most of the stuff from my server/index.js file to see if I could solve this problem, heres what it looks like:

import { createServer } from 'http'
import express from 'express'

import { typeDefs } from './types'
import resolvers from './resolvers'
import { ApolloServer } from 'apollo-server-express'

const PORT = process.env.PORT || 6001

const app = express()

const apollo = new ApolloServer({
  typeDefs,
  resolvers
})

apollo.applyMiddleware({ app })

const httpServer = createServer(app)

apollo.installSubscriptionHandlers(httpServer)

app.listen({ port: PORT }, () => {
  console.log(`server ready at http://localhost:${PORT}${apollo.graphqlPath}`)
  console.log(`Subscriptions ready at ws://localhost:${PORT}${apollo.subscriptionsPath}`)
})

My imports in package.json look like this:

"dependencies": {
    "apollo-server": "^2.1.0",
    "apollo-server-express": "^2.1.0",
    "bluebird": "^3.5.2",
    "body-parser": "^1.18.3",
    "compression": "^1.7.3",
    "cors": "^2.8.4",
    "express": "^4.16.4",
    "graphql": "^14.0.2",
    "graphql-playground-middleware-express": "^1.7.6",
    "graphql-subscriptions": "^1.0.0",
    "graphql-tools": "^4.0.2",
    "mongoose": "^5.3.4"
  },

Not really sure why the subscription endpoint isn’t properly being deployed through the apollo.installSubscriptionHandlers(httpServer) command.

[tensor-programming]

Never mind, figured it out right after I posted this.

[Hardronox]

Had the same issue, console was showing 400 error. Adding highlighted line from this article solved problem for me. https://www.apollographql.com/docs/apollo-server/data/subscriptions/#subscriptions-with-additional-middleware