The APIService class: requesting an access token

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Important note about Android Release apk builds.

Some students have reported that running requests with the APIService implemented in this video leads to SocketException errors in release mode.

Here's a relevant StackOverflow thread:

Flutter Http error SocketException: OS Error: Connection refused

To fix this, follow these two steps:

  • Ensure that the AndroidManifest.xml file contains the Internet permission: uses-permission android:name="android.permission.INTERNET"
  • Add an 'Accept': 'application/json' header when making the request:

final response = await http.post( api.tokenUri().toString(), headers: { 'Accept': 'application/json', 'Authorization': 'Basic ${api.apiKey}' }, );


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