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// Echoes the Referer header back to the client.
function handleRequest(aRequest, aResponse) {
aResponse.setStatusLine(aRequest.httpVersion, 200);
if (aRequest.hasHeader("Referer")) {
const referrer = aRequest.getHeader("Referer");
aResponse.setHeader("Content-Type", "text/html", false);
aResponse.write(referrer);
}
aResponse.setHeader("Access-Control-Allow-Origin", "*", false);
}