code: public RequestContext renderCode(final int code) {
          if (renderer instanceof JsonRenderer) {
              final JsonRenderer r = (JsonRenderer) renderer;
  
              final JSONObject ret = r.getJSONObject();
              ret.put(Keys.CODE, code);
          }
  
          return this;
      }
docs: Renders with {"code": int}.
  
  @param code the specified code
  @return this context