docs: public ChannelBuffer formatNotFoundV1() {
      StringBuilder output = 
        new StringBuilder(1024);
      if (query.hasQueryStringParam("jsonp")) {
        output.append(query.getQueryStringParam("jsonp") + "(");
      }
      output.append("{\"error\":{\"code\":");
      output.append(404);
      output.append(",\"message\":\"");
      if (query.apiVersion() > 0) {
        output.append("Endpoint not found");
      } else {
        output.append("Page not found");
      }
      output.append("\"}}");
      if (query.hasQueryStringParam("jsonp")) {
        output.append(")");
      }
      return ChannelBuffers.copiedBuffer(
          output.toString().getBytes(this.query.getCharset()));
    }