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next.js/examples/with-apollo-and-redux/lib/initApollo.js

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import { ApolloClient, createNetworkInterface } from 'react-apollo'
import fetch from 'isomorphic-unfetch'
let apolloClient = null
// Polyfill fetch() on the server (used by apollo-client)
if (!process.browser) {
global.fetch = fetch
}
function create () {
return new ApolloClient({
ssrMode: !process.browser, // Disables forceFetch on the server (so queries are only run once)
networkInterface: createNetworkInterface({
uri: 'https://api.graph.cool/simple/v1/cixmkt2ul01q00122mksg82pn', // Server URL (must be absolute)
opts: { // Additional fetch() options like `credentials` or `headers`
credentials: 'same-origin'
}
})
})
}
export default function initApollo () {
// Make sure to create a new client for every server-side request so that data
// isn't shared between connections (which would be bad)
if (!process.browser) {
return create()
}
// Reuse client on the client-side
if (!apolloClient) {
apolloClient = create()
}
return apolloClient
}