Android Studio suddenly (and for no apparent reason) started complaining that it could not find org.apache.http.legacy (which was added to build.gradle as a legacy library).

Warning: Unable to find optional library: org.apache.http.legacy

The issue was caused by a missing optional.json file that was supposed to be located in Android SDK folder ...AndroidSDK\platforms\android-23\optional



The error was resolved by re-installing Android SDK (v23 - Android 6.0).

Content of the missing optional.json file was:

"name": "org.apache.http.legacy",
"jar": "org.apache.http.legacy.jar",
"manifest": false

Android Studio 1.5.1
Android SDK 23

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