apollo-client does not work with CORS

Question

I am writing a graphql server component on AWS Lambda (NOT using graphql-server). On the client side I\'m using apollo-client. On the response of the lambda function I\'m sett

Answer 1

I'd assume you're using the AWS API Gateway.

One question for you is: have you enabled CORS for your gateway? See how

I believe that should solve your issues, if you're also sending cookies, you can also set the "Access-Control-Allow-Credentials" : true header as well. `

Answer 2

To workaround the CORS issue with Apollo you have to pass the no-cors option to the underlying fetch.

import ApolloClient from "apollo-boost";

const client = new ApolloClient({
  uri: "your client uri goes here",
  fetchOptions: {
    mode: 'no-cors',
  },
});

This is not a specific Apollo problem, rather a configuration that is meant to be tackled on the fetch side, see this for more information: https://developers.google.com/web/ilt/pwa/working-with-the-fetch-api#cross-origin_requests

I wonder why it does works with Axios for you, I'd expect you to have the no-cors mode set somewhere.

Answer 3

here is a working example. the server must have CORS enabled. that means the origin of your http request

origin: https://example.com

must match the access-control-allow-origin header of the response to your request.

access-control-allow-origin: https://example.com

Then on the Angular client you can use this module:

import {NgModule} from '@angular/core';
import {ApolloModule, APOLLO_OPTIONS} from 'apollo-angular';
import {HttpLinkModule, HttpLink} from 'apollo-angular-link-http';
import {InMemoryCache} from 'apollo-cache-inmemory';
import {environment} from 'src/environments/environment';
import {errorLink} from './dm-core/graphql/apollo-link-error';
import {concat} from 'apollo-link';

export function createApollo(httpLink: HttpLink) {
    return {
        link: concat(errorLink, httpLink.create({uri: environment.graphql, withCredentials: true})),
        cache: new InMemoryCache(),
        defaultOptions: {
            watchQuery: {
                errorPolicy: 'all'
            }
        }
    };
}

@NgModule({
    exports: [ApolloModule, HttpLinkModule],
    providers: [
        {
            provide: APOLLO_OPTIONS,
            useFactory: createApollo,
            deps: [HttpLink]
        }
    ]
})
export class GraphQLModule {}

Note the "withCredentials: true":

    link: concat(errorLink, httpLink.create({uri: environment.graphql, withCredentials: true})),

Answer 4

the first, fault we are doing is importing ApolloClient from 'apollo-boost'. Actually we have to import ApolloClient from 'apollo-client'.

import ApolloClient from 'apollo-client';

Because, ApolloClient from apollo-boost only supports a smaller subset of configuration options. ApolloClient from apollo-client gives you all the configuration options.

then we can provide link and cache only to Apollo-client instance

import { InMemoryCache } from "apollo-cache-inmemory";
import { createHttpLink } from 'apollo-link-http';

const client = new ApolloClient({ 
    link: new createHttpLink(
        {
            uri: "Your QraphQL Link"
        }
    ),
    cache: new InMemoryCache(),
});