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<meta charset="utf-8"/>
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<title>Network Monitor test page</title>
<p>Performing requests of various methods, with or without payload.</p>
<script type="text/javascript">
/* exported performRequest */
"use strict";
function performRequest(url, method, payload = null) {
const xhr = new XMLHttpRequest();, url, true);
xhr.setRequestHeader("Accept-Language", window.navigator.language);
xhr.setRequestHeader("X-Custom-Header-1", "Custom value");
xhr.setRequestHeader("X-Custom-Header-2", "");
xhr.setRequestHeader("X-Custom-Header-3", "Mon, 3 Mar 2014 11:11:11 GMT");