Error Network error: forward is not a function in apollo header authorixation code example

Example: Error Network error: forward is not a function in apollo header authorixation

import { ApolloClient } from 'apollo-client'
import { HttpLink } from 'apollo-link-http'
import { setContext } from 'apollo-link-context'
import { onError } from 'apollo-link-error'
import { InMemoryCache } from 'apollo-cache-inmemory'

const httpLink = new HttpLink({
  uri: // my api URI
})

const authLink = setContext((_, { headers }) => {
  // my authorization stuff
})

const errorLink = onError(({ graphQLErrors, networkError }) => {
  // my error handling logic
})

const apolloClient = new ApolloClient({
  link: authLink.concat(errorLink, httpLink),
  cache: new InMemoryCache()
})