code: function (requestV1) {
          if (!requestV1) { return; }
          if (requestV1.headers && _.isEmpty(requestV1.headerData)) {
              // this converts a newline concatenated string of headers to an array, so there are no descriptions
              return v1Common.parseHeaders(requestV1.headers, true);
          }
  
          // however, if non empty headerData already exists, sanitize it.
          return normalizeEntities(requestV1.headerData, this.options);
      }
docs: Normalizes a list of header data from the incoming raw v1 request.
  
  @param {Object} requestV1 - The raw v1 request object.
  @returns {Object[]} - The normalized list of header datum values.