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var headers = {};
for (var header of document.querySelectorAll("head meta, head link, head script")) {
var name = header.tagName.toLowerCase();
if (name === "meta") {
var key = header.getAttribute("name") || header.getAttribute("property");
} else if (name === "link" || name === "script") {
var key = header.getAttribute("rel");
}
var value = null;
if (header.hasAttribute("content")) {
value = header.getAttribute("content");
} else if (header.hasAttribute("href")) {
value = header.getAttribute("href");
} else if (header.hasAttribute("src")) {
value = header.getAttribute("src");
}
if (key && value) {
headers[key] = value;
}
}
console.log(headers);
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