aws sdk ETag does not match MD5 checksum

test.js

var AWS = require('aws-sdk');
var fs = require('fs');
var crypto = require('crypto');


var client = new AWS.S3({
    accessKeyId: process.env.S3_KEY,
    secretAccessKey: process.env.S3_SECRET,
});

var s3Path = "1tmp1/node_modules/chem-cli/node_modules/watchify2/node_modules/browserify/node_modules/browser-builtins/node_modules/http-browserify/example/json-stream/node_modules/JSONStream/test/fixtures/all_npm.json";
var localFile = "test_out.json";
var s3Params = {
  Bucket: process.env.S3_BUCKET,
  Key: s3Path,
};
var count = 1;
downloadOnce();
function downloadOnce() {
  doTheDownload(function(err) {
    if (err) throw err;
    console.log("downloaded", count++);
    downloadOnce();
  });
}

function doTheDownload(cb) {
  var request = client.getObject(s3Params);
  var response = request.createReadStream();
  var outStream = fs.createWriteStream(localFile);
  var hash = crypto.createHash('md5');
  var errorOccurred = false;
  var eTag = "";

  response.on('error', handleError);
  outStream.on('error', handleError);

  request.on('httpHeaders', function(statusCode, headers, resp) {
    if (statusCode < 300) {
      var contentLength = parseInt(headers['content-length'], 10);
      eTag = headers.etag || "";
    } else {
      handleError(new Error("http status code " + statusCode));
    }
  });

  hash.on('data', function(digest) {
    if (!compareETag(eTag, digest)) {
      console.log("eTag", eTag, "digest", digest.toString('hex'), "path:", localFile);
      handleError(new Error("ETag does not match MD5 checksum"));
    }
  });

  outStream.on('close', function() {
    if (errorOccurred) return;
    cb();
  });

  response.pipe(outStream);
  response.pipe(hash);

  function handleError(err) {
    if (errorOccurred) return;
    errorOccurred = true;
    cb(err);
  }
}

function compareETag(eTag, md5Buffer) {
  eTag = eTag.replace(/^\s*'?\s*"?\s*(.*?)\s*"?\s*'?\s*$/, "$1");
  var hex = md5Buffer.toString('hex');
  return eTag === hex;
}