+ /**
+ * Potentially add additional headers from static file meta-file.
+ * @param {http.ServerResponse} res
+ * @param {string} directory
+ * @param {string} fileName - already normalized and filtered
+ */
+ async _serveFileMetaHeaders(res, directory, fileName) {
+ const _scope = _fileScope('_serveFileMetaHeaders');
+ this.logger.debug(_scope, 'called', { directory, fileName });
+
+ const metaPrefix = '.';
+ const metaSuffix = '.meta';
+ const metaFileName = `${metaPrefix}${fileName}${metaSuffix}`;
+ const metaFilePath = path.join(directory, metaFileName);
+
+ const [stat, data] = await this._readFileInfo(metaFilePath);
+ if (!stat) {
+ return;
+ }
+
+ const lineBreakRE = /\r\n|\n|\r/;
+ const lines = data.toString().split(lineBreakRE);
+ common.unfoldHeaderLines(lines);
+
+ const headerParseRE = /^(?<name>[^:]+): +(?<value>.*)$/;
+ lines.forEach((line) => {
+ if (line) {
+ const result = headerParseRE.exec(line);
+ const { groups: header } = result;
+ res.setHeader(header.name, header.value);
+ }
+ });
+ }
+
+