code: public Result render(String padding, JsonNode node) {
          this.content = new RenderableJsonP(padding, node);
          setContentType(MimeTypes.JAVASCRIPT);
          charset = Charsets.UTF_8;
          return this;
      }
docs: Sets the content of the current result to the JSONP response using the given padding (callback). It also sets
  the content-type header to JavaScript and the charset to UTF-8.
  
  @param node the content
  @return the current result