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

Android OkHttp实现HTTPS访问,支持Android 4.X系统HTTPS访问 看到这个错误信息Caused by: java.lang.IllegalStateException: Expected Android API level 21+ but was 19，应该是版本的问题，去okhttp查了一下原来是自己没仔细看介绍 okhttp的fix分支3.12.x版本，而我项目里面

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