@Override
    public void cleanup() {
        try {
            if (stream != null) {
                stream.close();
            }
        } catch (IOException e) {
            // Ignored
        }
        if (responseBody != null) {
            responseBody.close();
        }
        callback = null;
    }
Fetches an {@link InputStream} using the okhttp library.
arms/src/main/java/com/jess/arms/http/OkHttpStreamFetcher.java