Build a blog using Strapi, Angular and Apollo

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Firt of all thanks for the tutorial. It is well documented.

However, I cannot get this to work… I tried a couple of times with installing different versions of node (last try was with v12.13.0).
Strapi is running well on localhost:1337. I followed all the steps for content management and creating the content types. My localhost:4200 is also running but it looks like this:

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image1920×992 40 KB

When inspecting, the console gives the following error:

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 what the problem might be?