问使用apollo link-ws中的WebSocketLink检查互联网连接

EN

const wsLink = new WebSocketLink({
uri: `ws://${hostname}${port ? `:${port}` : ''}/subscriptions`,
options: {
 reconnect: true,
 connectionParams: () => ({
  authorization: localStorage.getItem('accelerator-token')
 })
}
});

    const hasSubscriptionOperation = ({ query: { definitions } }) =>
    definitions.some(
    ({ kind, operation }) =>
      kind === 'OperationDefinition' && operation === 'subscription'
  );

const client = new ApolloClient({
link: ApolloLink.split(
    hasSubscriptionOperation,
    wsLink,
    ApolloLink.from([
      cleanTypenameLink,
      authMiddleware,
      errorLink,
      stateLink,
      createUploadLink()
    ])
  ),
  cache
});