How can I access the response headers of a request that is piped to a feedparser

I am trying to parse an RSS feed using request js and feedparser-promised libraries. I am able to parse the feed using the below code.

import Bottleneck from 'bottleneck';const feedparser = require('feedparser-promised');const limiter = new Bottleneck({  maxConcurrent: 1,  minTime: 333,});const httpOptions = {      uri: val.sourcefeedurl,      resolveWithFullResponse: true,      method: 'GET',      pool: false,      headers: {'If-None-Match': val.etag,'If-Modified-Since': val.LastModified,        Connection: 'keep-alive',        ciphers: 'DES-CBC3-SHA',      },    };const response = await limiter.schedule(() => feedparser.parse(httpOptions));

But since I use the feedparser-promised library I am not able to cache the etag and Last Modified from the response headers.

I tried modifying feedparser-promised like this

'use strict';const request = require('request');const feedParser = require('./feedParser');const parse = (requestOptions, feedparserOptions) => {  const metaData = {};  return new Promise((resolve, reject) => {    request.get(requestOptions).on('error', reject).on('response', async resp => {      if (resp.statusCode === 304) {        reject('Source not modified');      } else if (resp.statusCode === 200) {        metaData.etagin = await resp.headers.etag;        metaData.LastModifiedin = await resp.headers['last-modified'];        metaData.LastModifiedLocal = await resp.headers['last-modified'];        // console.log(metaData);      }    }).pipe(feedParser(feedparserOptions).on('error', reject).on('response', resolve));  });};module.exports = {  parse};

Below is the feedParser file

'use strict';const FeedParserStream = require('feedparser');module.exports = (feedparserOptions, metaData) => {  // console.log(metaData, 'herre');  const parsedItems = [];  const feedparser = new FeedParserStream(feedparserOptions);  // console.log(feedparser);  feedparser.on('readable', () => {    // console.log(resp);    let item;    while (item = feedparser.read()) {      parsedItems.push(item);    }    return parsedItems;  }).on('end', function next() {    this.emit('response', parsedItems);  });  return feedparser;};

So my question is how do I return the response headers along with the parsedItems (as in the code) while resolving the promise.

Help is very much appreciated.