/** * Adapted from https://searchfox.org/mozilla-central/source/layout/reftests/backgrounds/delay-image-response.sjs */ "use strict"; // A 1x1 PNG image. // Source: https://commons.wikimedia.org/wiki/File:1x1.png (Public Domain) const IMAGE = atob( "iVBORw0KGgoAAAANSUhEUgAAAAEAAAABAQMAAAAl21bKAAAAA1BMVEUAA" + "ACnej3aAAAAAXRSTlMAQObYZgAAAApJREFUCNdjYAAAAAIAAeIhvDMAAAAASUVORK5CYII=" ); // To avoid GC. let timer = null; function handleRequest(request, response) { const query = {}; request.queryString.split("&").forEach(function (val) { const [name, value] = val.split("="); query[name] = unescape(value); }); response.setStatusLine(request.httpVersion, 200, "OK"); response.setHeader("Content-Type", "image/png", false); // If there is no delay, we write the image and leave. if (!("delay" in query)) { response.write(IMAGE); return; } // If there is a delay, we create a timer which, when it fires, will write // image and leave. response.processAsync(); const nsITimer = Ci.nsITimer; timer = Cc["@mozilla.org/timer;1"].createInstance(nsITimer); timer.initWithCallback( function () { response.write(IMAGE); response.finish(); }, query.delay, nsITimer.TYPE_ONE_SHOT ); }