apollo client headers code example
Example 1: apollo client add custom header
import { ApolloClient, HttpLink, ApolloLink, InMemoryCache, concat } from '@apollo/client';
const httpLink = new HttpLink({ uri: '/graphql' });
const authMiddleware = new ApolloLink((operation, forward) => {
// add the authorization to the headers
operation.setContext({
headers: {
authorization: localStorage.getItem('token') || null,
}
});
return forward(operation);
})
const client = new ApolloClient({
cache: new InMemoryCache(),
link: concat(authMiddleware, httpLink),
});
Example 2: apollo client authentication
import { ApolloClient, createHttpLink, InMemoryCache } from '@apollo/client';
import { setContext } from '@apollo/client/link/context';
const httpLink = createHttpLink({
uri: '/graphql',
});
const authLink = setContext((_, { headers }) => {
// get the authentication token from local storage if it exists
const token = localStorage.getItem('token');
// return the headers to the context so httpLink can read them
return {
headers: {
...headers,
authorization: token ? `Bearer ${token}` : "",
}
}
});
const client = new ApolloClient({
link: authLink.concat(httpLink),
cache: new InMemoryCache()
});