JS script reading all response headers and iterate over them afterwards

Google Cloud Apigee
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2

This solved it

const responseHeaderNamesArray = responseHeaderNames.substring(1, responseHeaderNames.length - 1).split(',').map(h => h.trim());
// Remove brackets [], split string by comma, Trim whitespace

responseHeaderNamesArray.forEach(element => {
  print(element+": "+context.getVariable('response.header.'+element));
  // ... perform need operation for each response header
});

output is
Access-Control-Allow-Origin:
Content-Encoding: gzip
Content-Type: application/json; charset=utf-8
Vary: Origin
...etc.
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