docs: function probeOutputTransform(/*headers, data*/) {
    /*jshint validthis:true */
    var operation = this;
  
    var statusCode = operation.responseStatusCode;
    var exists     = (statusCode === 200) ? true : false;
    if (operation.contentOnly === true) {
      return exists;
    }
  
    var output = exists ? operation.responseHeaders : {};
    output.uri    = operation.uri;
    output.exists = exists;
  
    return output;
  }