public static LottieTask<LottieComposition> fromUrl(final Context context, final String url) {
    return fromUrl(context, url, "url_" + url);
  }
Fetch an animation from an http url. Once it is downloaded once, Lottie will cache the file to disk for
future use. Because of this, you may call `fromUrl` ahead of time to warm the cache if you think you
might need an animation in the future.
<p>
To skip the cache, add null as a third parameter.
lottie/src/main/java/com/airbnb/lottie/LottieCompositionFactory.java