title: Apollo on android: can't download schema or generate classes
body: <p>I'm trying Apollo and graphql for the first time and I want to use <a href="https://countries.trevorblades.com/" rel="nofollow noreferrer">this api</a> and I'm following the official example <a href="https://www.apollographql.com/docs/android/tutorial/02-add-the-graphql-schema/" rel="nofollow noreferrer">here</a>. However</p>
  <p>running the schema download task</p>
  <pre><code>gradlew :app:downloadApolloSchema --endpoint='https://countries.trevorblades.com/' --schema='app/src/main/graphql/com/trevorblades/countries/schema.json'
  </code></pre>
  <p>results in</p>
  <pre><code> Execution failed for task ':app:downloadApolloSchema'.
  &gt; Expected URL scheme 'http' or 'https' but no colon was found
  </code></pre>
  <p>with both the repo I want to use and the example's.</p>
  <p>If I try to manually download the schema using the button on the repo's page, place it in the correct directory and run</p>
  <pre><code>gradlew generateApolloSources
  </code></pre>
  <p>it results in</p>
  <pre><code> Failed to parse GraphQL schema introspection query from `[...]app\src\main\graphql\com\trevorblades\countries\schema.json`
  </code></pre>
  <p>again with both my repo and the one from the example.</p>
  <p>I've the feeling that I'm missing something really trivial here, but I really can't figure it out.</p>
  <p>any help will be appreciated.</p>