OkHttp Caused by: java.lang.IllegalStateException: Expected Android API level 21+ but was 19

Android OkHttp實現HTTPS訪問,支持Android 4.X系統HTTPS訪問 看到這個錯誤信息Caused by: java.lang.IllegalStateException: Expected Android API level 21+ but was 19，應該是版本的問題，去okhttp查了一下原來是自己沒仔細看介紹 okhttp的fix分支3.12.x版本，而我項目裏面

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