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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",[122],"36ebed44-3830-11f1-9695-42b51c65c3df","test-headers.ts","36ebee16-3830-11f1-9695-42b51c65c3df",12,["D",1776191515609],"// 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],"27c7e282-3830-11f1-9695-42b51c65c3df","reports.ts","27c7e372-3830-11f1-9695-42b51c65c3df",11,["D",1776191490193],"/**\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",[147],"24ae2298-3833-11f1-a2fe-42b51c65c3df","main.ts","799b064e-382f-11f1-8e50-42b51c65c3df",["D",1776192773459],5,"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}",[154],"ad09c360-3831-11f1-8a8a-42b51c65c3df","dns-query.ts","20d12b96-3830-11f1-bb30-42b51c65c3df",13,["D",1776192143269],"/**\n * DNS-over-HTTPS query handler.\n * Accepts base64url-encoded DNS wire-format queries, returns a fixed A record.\n *\n * Includes Report-To + NEL headers so browsers report 100% of successful\n * requests to the /reports collector endpoint.\n */\n\nconst REPORTS_URL =\n \"https://recvfrom--799b064e382f11f18e5042b51c65c3df.web.val.run/reports\";\n\n/** Reporting API v0 Report-To header value */\nconst REPORT_TO = JSON.stringify({\n group: \"dns-nel\",\n max_age: 2592000, // 30 days\n endpoints: [{ url: REPORTS_URL }],\n});\n\n/** NEL header — report 100% of successes AND 100% of failures */\nconst NEL = JSON.stringify({\n report_to: \"dns-nel\",\n max_age: 2592000,\n success_fraction: 1.0,\n failure_fraction: 0.0,\n});\n\nexport function handleDnsQuery(_req: Request, url: URL): Response {\n const dnsParam = url.searchParams.get(\"dns\");\n if (!dnsParam) {\n return new Response(\"Missing 'dns' query parameter\", { status: 400 });\n }\n\n // Decode the base64url-encoded DNS query\n let queryBytes: Uint8Array;\n try {\n const base64 = dnsParam.replace(/-/g, \"+\").replace(/_/g, \"/\");\n const padded = base64 + \"=\".repeat((4 - (base64.length % 4)) % 4);\n const binaryString = atob(padded);\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 base64url-encoded DNS query\", { status: 400 });\n }\n\n if (queryBytes.length < 12) {\n return new Response(\"DNS query too short\", { status: 400 });\n }\n\n const txId = queryBytes.slice(0, 2);\n\n // Find end of QNAME (null-terminated) + QTYPE (2) + QCLASS (2)\n let qnameEnd = 12;\n while (qnameEnd < queryBytes.length && queryBytes[qnameEnd] !== 0) {\n qnameEnd++;\n }\n qnameEnd++; // skip null terminator\n const questionEnd = qnameEnd + 4;\n const questionBytes = queryBytes.slice(12, questionEnd);\n\n // DNS response header\n const header = new Uint8Array(12);\n header[0] = txId[0];\n header[1] = txId[1];\n header[2] = 0x81; // QR=1, Opcode=0, AA=0, TC=0, RD=1\n header[3] = 0x80; // RA=1, Z=0, RCODE=0 (No Error)\n header[4] = 0x00;\n header[5] = 0x01; // QDCOUNT = 1\n header[6] = 0x00;\n header[7] = 0x01; // ANCOUNT = 1\n header[8] = 0x00;\n header[9] = 0x00; // NSCOUNT = 0\n header[10] = 0x00;\n header[11] = 0x00; // ARCOUNT = 0\n\n // Fixed A record answer: 93.184.216.34, TTL 300\n const answer = new Uint8Array([\n 0xc0,\n 0x0c, // Name: pointer to QNAME at offset 12\n 0x00,\n 0x01, // Type: A\n 0x00,\n 0x01, // Class: IN\n 0x00,\n 0x00,\n 0x01,\n 0x2c, // TTL: 300s\n 0x00,\n 0x04, // RDLENGTH: 4\n //93, 184, 216, 34, // RDATA: 93.184.216.34\n 172,\n 67,\n 75,\n 9,\n ]);\n\n // Assemble response\n const response = new Uint8Array(\n header.length + questionBytes.length + answer.length,\n );\n response.set(header, 0);\n response.set(questionBytes, header.length);\n response.set(answer, header.length + questionBytes.length);\n\n return new Response(response, {\n status: 200,\n headers: {\n \"Content-Type\": \"application/dns-message\",\n \"Cache-Control\": \"max-age=300\",\n \"Report-To\": REPORT_TO,\n \"NEL\": NEL,\n },\n 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Remixes1

Remixes
1