code: public String toRequestParam() {
  
          StringBuffer result = new StringBuffer(128);
          result.append('?');
          result.append(PARAM_SCALE);
          result.append('=');
          result.append(toString());
  
          return result.toString();
      }
docs: Creates a request parameter configured with the values from this image scaler, also
  appends a <code>'?'</code> char as a prefix so that this may be directly appended to an image URL.<p>
  
  This can be appended to an image request in order to apply image scaling parameters.<p>
  
  @return a request parameter configured with the values from this image scaler