Reading response headers with Fetch API

Question

I\'m in a Google Chrome extension with permissions for \"*://*/*\" and I\'m trying to make the switch from XMLHttpRequest to the Fetch API.

The extensio

Answer 1

For backward compatibility with browsers that do not support ES2015 iterators (and probably also need fetch/Promise polyfills), the Headers.forEach function is the best option:

r.headers.forEach(function(value, name) {
    console.log(name + ": " + value);
});

Tested in IE11 with Bluebird as Promise polyfill and whatwg-fetch as fetch polyfill. Headers.entries(), Headers.keys() and Headers.values() does not work.