code: function (data, legacy) {
          if (!data) { return; }
  
          var head,
              headers = [],
              statusValue = !legacy,
              match = regexes.header.exec(data),
              property = legacy ? 'enabled' : 'disabled';
  
          data = data.toString().replace(regexes.fold, '$1');
  
          while (match) {
              head = {
                  key: match[1],
                  value: match[3].replace(regexes.trim, '$1')
              };
  
              if (_.startsWith(head.key, headersCommentPrefix)) {
                  head[property] = statusValue;
                  head.key = head.key.replace(headersCommentPrefix, '').trim();
              }
  
              headers.push(head);
              match = regexes.header.exec(data);
          }
  
          return headers;
      }
docs: Parses a string of headers to an object.
  
  @param {String} data - A string of newline concatenated header key-value pairs.
  @param {?Boolean} [legacy] - A flag to indicate whether the parsing is being done for v1 normalization or v1 to
  v2 conversion.
  @returns {Object[]|*} - The parsed list of header key-value pair objects.
  @private