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Build a minimal DNS query for example.com A record\nfunction buildDnsQuery(): Uint8Array {\n const header = new Uint8Array([\n 0x00, 0x01, // Transaction ID\n 0x01, 0x00, // Flags: RD=1\n 0x00, 0x01, // QDCOUNT = 1\n 0x00, 0x00, // ANCOUNT = 0\n 0x00, 0x00, // NSCOUNT = 0\n 0x00, 0x00, // ARCOUNT = 0\n ]);\n\n // QNAME: \\x07example\\x03com\\x00\n const qname = new Uint8Array([\n 7, ...new TextEncoder().encode(\"example\"),\n 3, ...new TextEncoder().encode(\"com\"),\n 0,\n ]);\n\n // QTYPE=A (1), QCLASS=IN (1)\n const qtype = new Uint8Array([0x00, 0x01, 0x00, 0x01]);\n\n const query = new Uint8Array(header.length + qname.length + qtype.length);\n query.set(header, 0);\n query.set(qname, header.length);\n query.set(qtype, header.length + qname.length);\n return query;\n}\n\n// Base64url encode (no padding)\nfunction base64urlEncode(bytes: Uint8Array): string {\n let binary = \"\";\n for (const b of bytes) binary += String.fromCharCode(b);\n return btoa(binary).replace(/\\+/g, \"-\").replace(/\\//g, \"_\").replace(/=+$/, \"\");\n}\n\nconst query = buildDnsQuery();\nconst encoded = base64urlEncode(query);\nconsole.log(\"Base64url DNS query:\", encoded);\n\nconst endpoint = \"https://recvfrom--799b064e382f11f18e5042b51c65c3df.web.val.run\";\nconst url = `${endpoint}/dns-query?dns=${encoded}`;\nconsole.log(\"Fetching:\", url);\n\nconst resp = await fetch(url);\nconsole.log(\"Status:\", resp.status);\nconsole.log(\"Content-Type:\", resp.headers.get(\"content-type\"));\n\nconst body = new Uint8Array(await resp.arrayBuffer());\nconsole.log(\"Response length:\", body.length, \"bytes\");\nconsole.log(\"Response hex:\", Array.from(body).map(b => b.toString(16).padStart(2, \"0\")).join(\" \"));\n\n// Parse the response\nconst txId = (body[0] << 8) | body[1];\nconst flags = (body[2] << 8) | body[3];\nconst qdcount = (body[4] << 8) | body[5];\nconst ancount = (body[6] << 8) | body[7];\nconsole.log(`TX ID: ${txId}, Flags: 0x${flags.toString(16)}, QDCOUNT: ${qdcount}, ANCOUNT: ${ancount}`);\n\n// Check answer section IP\nconst answerStart = body.length - 4;\nconsole.log(`Answer IP: ${body[answerStart]}.${body[answerStart+1]}.${body[answerStart+2]}.${body[answerStart+3]}`);\n","deleted","label",[123],"3c62733e-399c-11f1-942b-42b51c65c3df","test-headers.ts","019d9695-5222-70cf-9024-b6b4b09a6b35",["D",1776347861273],"// Verify that the DNS query response includes Report-To and NEL headers\nconst endpoint = \"https://recvfrom--799b064e382f11f18e5042b51c65c3df.web.val.run\";\nconst resp = await fetch(`${endpoint}/dns-query?dns=AAEBAAABAAAAAAAAB2V4YW1wbGUDY29tAAABAAE`);\n\nconsole.log(\"Status:\", resp.status);\nconsole.log(\"Content-Type:\", resp.headers.get(\"content-type\"));\nconsole.log(\"Report-To:\", resp.headers.get(\"report-to\"));\nconsole.log(\"NEL:\", resp.headers.get(\"nel\"));\n",[140],"3c626ac4-399c-11f1-942b-42b51c65c3df","reports.ts","019d9695-5222-70cf-9024-b29a29aa3c76",["D",1776347861273],"/**\n * Reporting API v0 collector endpoint.\n *\n * Browsers POST an array of report objects as `application/reports+json`.\n * Each report has: { age, type, url, user_agent, body: { ... } }\n *\n * For NEL reports, body contains fields like:\n * sampling_fraction, server_ip, protocol, method, status_code,\n * elapsed_time, phase, type (e.g. \"ok\", \"dns.name_not_resolved\", etc.)\n */\n\nexport async function handleReports(req: Request): Promise {\n const contentType = req.headers.get(\"content-type\") ?? \"\";\n\n if (\n !contentType.includes(\"application/reports+json\") &&\n !contentType.includes(\"application/json\")\n ) {\n return new Response(\"Unsupported Content-Type\", { status: 415 });\n }\n\n let reports: unknown;\n try {\n reports = await req.json();\n } catch {\n return new Response(\"Invalid JSON\", { status: 400 });\n }\n\n if (!Array.isArray(reports)) {\n return new Response(\"Expected a JSON array of reports\", { status: 400 });\n }\n\n // Log each report for visibility in Val Town traces/logs\n for (const report of reports) {\n console.log(\"[report]\", JSON.stringify(report));\n }\n\n console.log(`Received ${reports.length} report(s)`);\n\n // Respond 204 No Content — the browser expects a success status and no body\n return new Response(null, {\n status: 204,\n headers: {\n \"Access-Control-Allow-Origin\": \"*\",\n },\n });\n}\n",[146],"3c626056-399c-11f1-942b-42b51c65c3df","main.ts","019d9695-5222-70cf-9024-acfdd69f88af",["D",1776347861273],"http","/**\n * DNS-over-HTTPS (DoH) style endpoint with Reporting API v0 (NEL) integration.\n *\n * Routes:\n * GET /dns-query?dns= — DoH resolver (fixed A record response)\n * POST /reports — Reporting API v0 collector endpoint\n */\nimport { handleDnsQuery } from \"./dns-query.ts\";\nimport { handleReports } from \"./reports.ts\";\n\nexport default async function (req: Request): Promise {\n const url = new URL(req.url);\n\n if (url.pathname === \"/dns-query\" && req.method === \"GET\") {\n return handleDnsQuery(req, url);\n }\n\n if (url.pathname === \"/reports\" && req.method === \"POST\") {\n return handleReports(req);\n }\n\n // CORS preflight for /reports (browsers send OPTIONS before POST)\n if (url.pathname === \"/reports\" && req.method === \"OPTIONS\") {\n return new Response(null, {\n status: 204,\n headers: {\n \"Access-Control-Allow-Origin\": \"*\",\n \"Access-Control-Allow-Methods\": \"POST\",\n \"Access-Control-Allow-Headers\": \"Content-Type\",\n \"Access-Control-Max-Age\": \"86400\",\n },\n });\n }\n\n return new Response(\"Not Found\", { status: 200 });\n}",[152],"ffa6051e-4026-11f1-bcbf-42b51c65c3df","dns-query.ts","019d9695-5222-70cf-9024-ab8274da1b69",["D",1777067166685],10,"/**\n * DNS-over-HTTPS query handler.\n * - struct-dns-v1.example.com: Returns SERVFAIL + JSON EDE metadata.\n * - Others: Returns A record from DOMAIN_MAP or a default IP.\n */\n\n// 1. Dictionary mapping domain names to IP addresses\nconst DOMAIN_MAP: Record = {\n \"google.com\": \"142.251.211.174\",\n \"www.google.com\": \"142.251.156.119\",\n \"example.com\": \"93.184.216.34\",\n \"www.gstatic.com\": \"142.251.211.67\",\n \"play.google.com\": \"142.251.211.206\",\n \"safebrowsing.googleapis.com\": \"142.251.41.170\",\n \"clients2.google.com\": \"142.251.211.142\",\n \"a.nel.cloudflare.com\": \"35.190.80.1\",\n \"translate.googleapis.com\": \"142.250.72.10\",\n \"optimizationguide-pa.googleapis.com\": \"216.239.38.223\",\n \"mtalk.google.com\": \"142.251.163.188\",\n};\n\nconst ERROR_DOMAIN = \"struct-dns-v1.example.com\";\n\n/** Helper: Converts DNS wire-format QNAME to a string */\nfunction parseQName(\n bytes: Uint8Array,\n start: number,\n): { name: string; end: number } {\n let parts: string[] = [];\n let i = start;\n while (bytes[i] !== 0 && i < bytes.length) {\n let len = bytes[i];\n i++;\n let label = new TextDecoder().decode(bytes.slice(i, i + len));\n parts.push(label);\n i += len;\n }\n return { name: parts.join(\".\"), end: i + 1 };\n}\n\n/** Helper: Converts \"1.2.3.4\" string to Uint8Array */\nfunction ipToBytes(ip: string): Uint8Array {\n return new Uint8Array(ip.split(\".\").map((octet) => parseInt(octet, 10)));\n}\n\nexport function handleDnsQuery(_req: Request, url: URL): Response {\n const dnsParam = url.searchParams.get(\"dns\");\n if (!dnsParam) return new Response(\"Missing 'dns'\", { status: 400 });\n\n let queryBytes: Uint8Array;\n try {\n const base64 = dnsParam.replace(/-/g, \"+\").replace(/_/g, \"/\");\n const binaryString = atob(\n base64 + \"=\".repeat((4 - (base64.length % 4)) % 4),\n );\n queryBytes = new Uint8Array(binaryString.length);\n for (let i = 0; i < binaryString.length; i++) {\n queryBytes[i] = binaryString.charCodeAt(i);\n }\n } catch {\n return new Response(\"Invalid base64\", { status: 400 });\n }\n\n const txId = queryBytes.slice(0, 2);\n const { name: qname, end: qnameEnd } = parseQName(queryBytes, 12);\n const questionBytes = queryBytes.slice(12, qnameEnd + 4);\n\n // 1. CASE: Structured Error Domain (REFUSED + EDE)\n if (qname === ERROR_DOMAIN) {\n const extraText = JSON.stringify({\n c: [\"mailto:awillia@google.com\"],\n j: \"test draft-nottingham-public-resolver-errors-02\",\n fdbs: [{ db: \"lumen\", id: \"test01\" }],\n });\n const textBytes = new TextEncoder().encode(extraText);\n const edeOptionLen = 2 + textBytes.length;\n const rdLength = 4 + edeOptionLen;\n\n const header = new Uint8Array(12);\n header.set(txId);\n header[2] = 0x81;\n header[3] = 0x85; // RA=1, RCODE=5 (REFUSED)\n header[5] = 0x01; // QDCOUNT 1\n header[11] = 0x01; // ARCOUNT 1 (Our OPT record)\n\n const additional = new Uint8Array(11 + rdLength);\n additional.set([\n 0x00,\n 0x00,\n 0x29,\n 0x10,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n (rdLength >> 8) & 0xff,\n rdLength & 0xff,\n 0x00,\n 0x0f,\n (edeOptionLen >> 8) & 0xff,\n edeOptionLen & 0xff,\n 0x00,\n 0x11, // EDE Info Code: 17 (Filtered)\n ]);\n additional.set(textBytes, 11 + 6);\n\n const res = new Uint8Array(\n header.length + questionBytes.length + additional.length,\n );\n res.set(header, 0);\n res.set(questionBytes, 12);\n res.set(additional, 12 + questionBytes.length);\n\n return new Response(res, {\n headers: { \"Content-Type\": \"application/dns-message\" },\n });\n } // 2. CASE: Known Domain (Return A Record)\n else if (DOMAIN_MAP[qname]) {\n const ipBytes = ipToBytes(DOMAIN_MAP[qname]);\n const header = new Uint8Array(12);\n header.set(txId);\n header[2] = 0x81;\n header[3] = 0x80; // NOERROR\n header[5] = 0x01;\n header[7] = 0x01;\n\n const answer = new Uint8Array([\n 0xc0,\n 0x0c,\n 0x00,\n 0x01,\n 0x00,\n 0x01,\n 0x00,\n 0x00,\n 0x01,\n 0x2c,\n 0x00,\n 0x04,\n ...Array.from(ipBytes),\n ]);\n\n const res = new Uint8Array(\n header.length + questionBytes.length + answer.length,\n );\n res.set(header, 0);\n res.set(questionBytes, 12);\n res.set(answer, 12 + questionBytes.length);\n\n return new Response(res, {\n headers: { \"Content-Type\": \"application/dns-message\" },\n });\n } // 3. DEFAULT: NXDOMAIN\n else {\n const header = new Uint8Array(12);\n header.set(txId);\n header[2] = 0x81;\n header[3] = 0x83; // RA=1, RCODE=3 (NXDOMAIN)\n header[5] = 0x01;\n\n const res = new Uint8Array(header.length + questionBytes.length);\n res.set(header, 0);\n res.set(questionBytes, 12);\n\n return new Response(res, {\n headers: { \"Content-Type\": \"application/dns-message\" },\n });\n }\n}",[159],"pulls","branches","forks","envVars",{"_172":39,"_174":39},"connections",{"_172":39,"_173":39},"count","unfilledCount","emptyCount",{"_18":158,"_20":159,"_124":160,"_126":-5,"_127":65,"_128":63,"_130":105,"_22":193,"_62":162,"_132":133,"_134":163,"_136":26,"_137":-5,"_181":194,"_85":195},{"_18":151,"_20":152,"_124":153,"_126":-5,"_127":65,"_128":129,"_130":105,"_22":190,"_62":39,"_132":155,"_134":156,"_136":26,"_137":-5,"_181":191,"_85":192},{"_18":145,"_20":146,"_124":147,"_126":-5,"_127":65,"_128":129,"_130":105,"_22":187,"_62":39,"_132":133,"_134":149,"_136":26,"_137":-5,"_181":188,"_85":189},{"_18":139,"_20":140,"_124":141,"_126":-5,"_127":65,"_128":129,"_130":105,"_22":184,"_62":39,"_132":133,"_134":143,"_136":26,"_137":-5,"_181":185,"_85":186},{"_18":122,"_20":123,"_124":125,"_126":-5,"_127":65,"_128":129,"_130":105,"_22":180,"_62":39,"_132":133,"_134":135,"_136":26,"_137":-5,"_181":182,"_85":183},["D",1776347861273],"children",[],[123],["D",1776347861273],[],[140],["D",1776347861273],[],[146],["D",1776347861273],[],[152],["D",1777067166685],[],[159],["D",1776347861273],{"_16":17,"_83":79},{"_16":17,"_77":-5,"_78":79,"_32":33,"_80":81,"_82":26},{"_62":63,"_20":64,"_18":65,"_66":19,"_67":68,"_69":70,"_71":28,"_72":73,"_74":41,"_75":21,"_76":17},"ctx",{"_55":-5,"_107":233,"_234":235,"_236":237,"_238":26,"_239":26,"_240":26,"_241":105,"_242":-5,"_243":-7,"_244":-7,"_245":39,"_246":26,"_247":26,"_248":-5,"_249":26,"_250":26,"_251":26,"_252":-5},"ENV",{"_204":205,"_206":207,"_208":64,"_209":210,"_211":212,"_213":214,"_215":216,"_217":218,"_219":220,"_221":222,"_223":224,"_225":226,"_227":228,"_229":230,"_231":232},"REACT_APP_SENTRY_DSN","https://586020d86f05489db63a554690acf1e9@o1398359.ingest.sentry.io/6724499","RENDER_GIT_COMMIT","e87eb04e707cf64e7e532c8e8ec395f209e17f15","RENDER_GIT_BRANCH","POSTHOG_API_TOKEN","phc_nmoyuAkStEZuUp69rYlg1DZgrIt19Gx0Y4Hwf8tGgJP","POSTHOG_API_HOST","https://wart.val.town","WEB_API_TEMPLATE","https://{val}.web.val.run","APP_URL","https://www.val.town","MODULE_URL","https://esm.town","VANITY_WEB_API_TEMPLATE","https://{label}.val.run/","DENOLS_URL","https://lsp.val.town","NODE_ENV","production","CLOUDFLARE_TURNSTILE_SITE_KEY","0x4AAAAAACtaIZJH7s9rBMZ6","GOOGLE_CLIENT_ID","875989696899-jtsqkhlbdv5jrlsk8631p7ipjg3c6o62.apps.googleusercontent.com","STRIPE_PUBLISHABLE_KEY","pk_live_51N2zvWEpZTTLipIkVEwXrUG9AT0yeOOEYxszarZT1jpsZV58Ly6wlg3SltZpHN26CUalOBmUSY7adQRQiSkCZz2500qSXNkf8Y","API_URL","https://api.val.town",[],"preferencesKeybindings","default","preferencesTheme","light","preferencesFixers","preferencesCopilot","preferencesSelectionAi","preferencesCloseBrackets","preferencesChatPanelState","preferencesDprint","preferencesDenofmt","notificationCount","flagDenols","isBusinessOrgMember","businessOrgHandle","isBusinessOrgAdmin","isHigherTownieTier","navCollapsed","currentOrgId"]

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