@Override
    public long getContentLength() {
        /* length of decompressed content is not known */
        return -1;
    }
Constructs a new {@link DecompressingEntity}.

@param wrapped the non-null {@link HttpEntity} to be wrapped
@param inputStreamFactory factory to create decompressing stream.
httpclient5/src/main/java/org/apache/hc/client5/http/entity/DecompressingEntity.java