private InputStream initWrapper() throws IOException {
        if (wrapperStream == null) {
            wrapperStream = inputStreamFactory.create(in);
        }
        return wrapperStream;
    }
Lazy initializes from an {@link InputStream} wrapper.
httpclient5/src/main/java/org/apache/hc/client5/http/entity/LazyDecompressingInputStream.java