code: private Response make() throws IOException {
          if (this.transformed.isEmpty()) {
              this.transformed.add(
                  new RsWithBody(
                      this.origin,
                      RsPrettyJson.transform(this.origin.body())
                  )
              );
          }
          return this.transformed.get(0);
      }
docs: Make a response.
  @return Response just made
  @throws IOException If fails