code: public @Nullable String jsFunction_stringEntity() throws IOException {
  		HttpCoreHelper httpHelper = new HttpCoreHelper();
  		if (httpHelper.hasEntity(req)) {
  			HttpEntity entity = ((HttpEntityEnclosingRequest)req).getEntity();
  			return IO.readAndCloseUtf8(entity.getContent());
  		} else {
  			return null;
  		}
  	}
docs: TODO don't use it