Don't throw an exception, as this is a valid case. This can happen if a request is cancelled while it's still processing the data.
Code is from 11/11/2014. The pair of callstacks that lead me to this:
E/VIMEO ( 5941): Error getting video: E/VIMEO ( 5941): java.util.concurrent.CancellationException E/VIMEO ( 5941): at com.koushikdutta.async.future.SimpleFuture.cancelInternal(SimpleFuture.java:39) E/VIMEO ( 5941): at com.koushikdutta.async.future.SimpleFuture.cancel(SimpleFuture.java:54) E/VIMEO ( 5941): at com.koushikdutta.ion.Ion.cancelAll(Ion.java:351) E/VIMEO ( 5941): at com.koushikdutta.ion.Ion.cancelAll(Ion.java:382) E/VIMEO ( 5941): at tv.ouya.console.launcher.store.DetailsActivity.onPause(DetailsActivity.java:568) E/VIMEO ( 5941): at android.app.Activity.performPause(Activity.java:5161) E/VIMEO ( 5941): at android.app.Instrumentation.callActivityOnPause(Instrumentation.java:1225) E/VIMEO ( 5941): at android.app.ActivityThread.performPauseActivity(ActivityThread.java:2825) E/VIMEO ( 5941): at android.app.ActivityThread.performPauseActivity(ActivityThread.java:2794) E/VIMEO ( 5941): at android.app.ActivityThread.handlePauseActivity(ActivityThread.java:2772) E/VIMEO ( 5941): at android.app.ActivityThread.access$800(ActivityThread.java:130) E/VIMEO ( 5941): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1212) E/VIMEO ( 5941): at android.os.Handler.dispatchMessage(Handler.java:99) E/VIMEO ( 5941): at android.os.Looper.loop(Looper.java:137) E/VIMEO ( 5941): at android.app.ActivityThread.main(ActivityThread.java:4745) E/VIMEO ( 5941): at java.lang.reflect.Method.invokeNative(Native Method) E/VIMEO ( 5941): at java.lang.reflect.Method.invoke(Method.java:511) E/VIMEO ( 5941): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) E/VIMEO ( 5941): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) E/VIMEO ( 5941): at dalvik.system.NativeStart.main(Native Method)
-- and --
E/AndroidRuntime( 5941): FATAL EXCEPTION: ion-ion E/AndroidRuntime( 5941): java.lang.RuntimeException: Not all data was consumed by Util.emitAllData E/AndroidRuntime( 5941): at com.koushikdutta.async.Util.emitAllData(Util.java:45) E/AndroidRuntime( 5941): at com.koushikdutta.async.http.ResponseCacheMiddleware$CachedBodyEmitter.spewInternal(ResponseCacheMiddleware.java:413) E/AndroidRuntime( 5941): at com.koushikdutta.async.http.ResponseCacheMiddleware$1.run(ResponseCacheMiddleware.java:167) E/AndroidRuntime( 5941): at com.koushikdutta.async.AsyncServer.lockAndRunQueue(AsyncServer.java:708) E/AndroidRuntime( 5941): at com.koushikdutta.async.AsyncServer.runLoop(AsyncServer.java:725) E/AndroidRuntime( 5941): at com.koushikdutta.async.AsyncServer.run(AsyncServer.java:626) E/AndroidRuntime( 5941): at com.koushikdutta.async.AsyncServer.access$700(AsyncServer.java:41) E/AndroidRuntime( 5941): at com.koushikdutta.async.AsyncServer$13.run(AsyncServer.java:568)