code: private Response make() throws IOException {
          if (this.zipped.isEmpty()) {
              this.zipped.add(
                  new RsWithHeader(
                      new RsWithBody(
                          this.origin,
                          RsGzip.gzip(this.origin.body())
                      ),
                      "Content-Encoding",
                      "gzip"
                  )
              );
          }
          return this.zipped.get(0);
      }
docs: Make a response.
  @return Response just made
  @throws IOException If fails