code: public static OperationBuilder write(final InputStream stream)
     {
        return new HttpOperation() {
           @Override
           public void performHttp(final HttpServletRewrite event, final EvaluationContext context)
           {
              try {
                 Streams.copy(stream, event.getResponse().getOutputStream());
              }
              catch (IOException e) {
                 throw new RewriteException("Could not write stream [" + stream + "] to response stream.", e);
              }
           }
  
           @Override
           public String toString()
           {
              return "Response.write(" + stream + ")";
           }
        };
     }
docs: Create an {@link Operation} that writes the contents of the given {@link InputStream} current
  {@link HttpServletResponse} upon execution.