The type org.apache.http.Header cannot be resolved. It is indirectly referenced from required .class

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from：https://stackoverflow.com/questions/32434488/the-type-org-apache-http-header-cannot-be-resolved-it-is-indirectly-referenced

If you are compiling against Android 6.0 (SDK 23), you need to include org.apache.http.legacy library.

In Android Studio add

 android {
    useLibrary 'org.apache.http.legacy'
}

to build.gradle.

In Eclipse copy org.apache.http.legacy.jar from AndroidSDK/platforms/android-23/optional to libs folder.