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Reading tracker data and returning to the landing page…

\n \n \n\n`;\n\n// Collector page that visits all sites and collects iframe data via postMessage\nconst collectHtml = `\n\n\n \n \n \n Collecting Tracker Data\n \n \n

Collecting tracker data from all sites...

Initializing...

\n\n \n \n\n`;\n\nconst indexHtml = `\n\n\n \n \n \n Demo Tracker Domain\n \n \n

Tracker Detection Demo — Demo Tracker Domain

This domain plays the tracker. Open the landing page instead.

/tracker.js?site=N — script embedded by the test sites (writes first-party storage)
/frame?site=N — iframe embedded by the test sites (writes this domain's storage)
/helper?return_url=... — reports this domain's storage back as ?tracker_data=
/collect?sites=...&return=... — collects iframe data from all sites via postMessage

\n \n\n`;\n\n// Escape for embedding inside a double-quoted JS string literal in the page.\nfunction jsString(value: string): string {\n return value\n .replace(/\\\\/g, \"\\\\\\\\\")\n .replace(/\"/g, '\\\\\"')\n .replace(/ 0 &&\n !ALLOWED_RETURN_ORIGINS.includes(parsed.origin)\n ) {\n return DEFAULT_RETURN_URL;\n }\n return parsed.toString();\n}\n\n// Learn more: https://docs.val.town/vals/http/\nexport default async function (req: Request): Promise {\n const url = new URL(req.url);\n\n if (url.pathname === \"/tracker.js\") {\n const body = trackerJs\n .replace(\"__STORAGE_KEY__\", jsString(STORAGE_KEY))\n .replace(\"__SITE__\", jsString(siteLabel(url)));\n\n return new Response(body, {\n headers: {\n \"content-type\": \"application/javascript; charset=utf-8\",\n \"cache-control\": \"no-store\",\n },\n });\n }\n\n if (url.pathname === \"/frame\") {\n const body = frameHtml\n .replace(\"__STORAGE_KEY__\", jsString(STORAGE_KEY))\n .replace(\"__SITE__\", jsString(siteLabel(url)));\n\n return new Response(body, {\n headers: {\n \"content-type\": \"text/html; charset=utf-8\",\n \"cache-control\": \"no-store\",\n },\n });\n }\n\n if (url.pathname === \"/helper\") {\n const body = helperHtml\n .replace(\"__NEXT_URL__\", jsString(resolveReturnUrl(url)))\n .replace(\"__STORAGE_KEY__\", jsString(STORAGE_KEY));\n\n return new Response(body, {\n headers: {\n \"content-type\": \"text/html; charset=utf-8\",\n \"cache-control\": \"no-store\",\n },\n });\n }\n\n if (url.pathname === \"/collect\") {\n // Parse sites from query params\n const sitesParam = url.searchParams.get(\"sites\");\n const returnUrl = url.searchParams.get(\"return_url\") || DEFAULT_RETURN_URL;\n\n // Default to all 3 sites if not specified\n const sites = sitesParam\n ? 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Code