To handle access and refresh tokens with Apollo, GraphQL, and React, you typically need to integrate authentication and token management into your frontend application. Here's a general overview of the steps involved:

  1. Authentication: Implement the authentication mechanism on your backend using GraphQL. This may involve using a library like Passport.js, JWT (JSON Web Tokens), or OAuth for authentication and generating access and refresh tokens.

  2. Storing Tokens: When a user logs in, your backend should generate an access token and a refresh token. The access token is a short-lived token used to access protected resources on the server, while the refresh token is a longer-lived token used to obtain a new access token when the current one expires.

  3. Apollo Client Setup: Configure Apollo Client in your React application to include the access token in the request headers for all GraphQL requests. You can use the Apollo createHttpLink function with an AuthLink middleware to attach the access token to each request. The refresh token can be stored securely in a React context or a state management solution like Redux.

  4. Token Expiration and Refresh: Monitor the expiration of the access token on the client-side. If the token is about to expire or has expired, use the refresh token to request a new access token from the backend. When you receive a new access token, update the client-side storage with the new token and proceed with the original request.

  5. Error Handling: Handle server responses indicating that the access token is invalid or expired. If the server returns a specific error for expired tokens, you can catch it in your Apollo Client and trigger the token refresh process.

  6. Logout: Implement a logout mechanism to clear the access and refresh tokens from the client-side storage. When a user logs out, invalidate the tokens on the server-side as well.

Here's an example of how the Apollo Client setup might look like:

import { ApolloClient, InMemoryCache, createHttpLink } from '@apollo/client'; import { setContext } from '@apollo/client/link/context'; const httpLink = createHttpLink({ uri: '/graphql', // Your GraphQL endpoint }); const authLink = setContext((_, { headers }) => { // Get the access token from your client-side storage (e.g., localStorage or a React context) const accessToken = localStorage.getItem('accessToken'); return { headers: { ...headers, authorization: accessToken ? `Bearer ${accessToken}` : '', }, }; }); const client = new ApolloClient({ link: authLink.concat(httpLink), cache: new InMemoryCache(), }); export default client;

Please note that this is a high-level overview, and the implementation details may vary based on your specific backend and frontend setup. Additionally, ensure you follow best practices for token management and security to protect your users' data and privacy.

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