It’s here:

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';
const uri = environment.graphqlUrl; // <-- add the URL of the GraphQL server here
export function createApollo(httpLink: HttpLink) {
return {
link: httpLink.create({ uri }),
cache: new InMemoryCache(),
};
}
@NgModule({
exports: [ApolloModule, HttpLinkModule],
providers: [
{
provide: APOLLO_OPTIONS,
useFactory: createApollo,
deps: [HttpLink],
},
],
})
export class GraphQLModule { }

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