gistfile1.txt

// graphql/index.js

import ApolloClient, { createNetworkInterface } from "react-apollo";

const createClient = ({ endpointUri: uri, onError }) => {
  const networkInterface = createNetworkInterface({ uri });

  networkInterface.useAfter([{
    applyAfterware({ response }, next) {
      if (response.status === 500) {
        return onError(new Error(`A fatal error occurred`));
      }

      next();
    }
  }]);

  return new ApolloClient({ networkInterface });
};

export { createClient };