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Apollo Server network error: unable to reach server

I'm trying to develop a backend with Apollo Server, I have enabled cors in my browser and tried adding the `cors: {origin: true}` configuration in the server. I have included the server code below. Hopefully someone is able to spot what I messed up on. ``` // index.js const {ApolloServer} = require('apollo-server') const typeDefs = require('./schema') const resolvers = require('./resolvers') const CourseAPI = require('./sources') const apollo = new ApolloServer({ typeDefs, resolvers, cors: { origin: true }, dataSources: () => { return { courseAPI: new CourseAPI({ client: 'pg', connection: { host: 'ec2-79-125-30-28.eu-west-1.compute.amazonaws.com', user: 'hgsfclebwdvtrz', password: '975260d79ace6b3f78132e6d51f8f56612e6cbc24c8d6063b9c6be60f5160453', database: 'd7jasm9tcmpc30' } }) } } }) apollo.listen().then(({url}) => { console.log(`🚀 Server ready at ${url}`) }) ```