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<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
</body>
</html>
 
headers = new Headers([['X-Foo', 'a=b, and c'],['X-Foo',' d=e']])
for(let header of headers) {
  console.log(header);
}
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anonymouspro
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