"use strict"; Cu.importGlobalProperties(["URLSearchParams"]); const HTML_DATA = ` Test for Bug 1222285 `; function handleRequest(request, response) { response.setHeader("Cache-Control", "no-cache", false); response.setHeader("Content-Type", "text/html", false); let queryString = new URLSearchParams(request.queryString); let language = queryString.get("language"); if (language) { response.setHeader("Content-Language", language, false); } response.write(HTML_DATA); }