Cannot see my articles in my Angular Strapi Blog

I have the same problem but a different issue. No articles are shown and my console gives the following errors:

:1337/graphql:1:        Failed to load resource: the server responded with a status of 400 (Bad Request)
core.js:6014 
        
       ERROR Error: Network error: Http failure response for http://localhost:1337/graphql: 400 Bad Request
    at new ApolloError (bundle.esm.js:63:1)
    at bundle.esm.js:1247:1
    at bundle.esm.js:1559:1
    at Set.forEach (<anonymous>)
    at bundle.esm.js:1557:1
    at Map.forEach (<anonymous>)
    at QueryManager.push../node_modules/apollo-client/bundle.esm.js.QueryManager.broadcastQueries (bundle.esm.js:1555:1)
    at bundle.esm.js:1161:1
    at ZoneDelegate.invoke (zone-evergreen.js:359:1)
    at Object.onInvoke (core.js:39699:1)

Any ideas? Something with Apollo and graphqp, but I have no idea…