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{ httpEndpoint } from \"https://esm.town/v/std/utils/index.ts\";\n\n// 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(/=+$/, \"\");\n}\n\nconst query = buildDnsQuery();\nconst encoded = base64urlEncode(query);\nconsole.log(\"Base64url DNS query:\", encoded);\n\nconst endpoint = await httpEndpoint(\"./main.ts\");\nconst url = `${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","// 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(/=+$/, \"\");\n}\n\nconst query = buildDnsQuery();\nconst encoded = base64urlEncode(query);\nconsole.log(\"Base64url DNS query:\", encoded);\n\nconst endpoint = await httpEndpoint(\"./main.ts\");\nconst url = `${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","createdAt",["D",1776191341814],"branchVersion","branchId","79974298-382f-11f1-8e50-42b51c65c3df","id","79967016-382f-11f1-8e50-42b51c65c3df","DoH-Reporting-API-Example",["D",1776191197971],"deletedAt","legacyEnvVars","privacy","public","httpPrivacy","description","imageUrl","019a794a-0679-70fc-ae0d-f9def04035cc","pinnedFileId","pinPreview","pinMigrated","screenshotVersion","likeCount",0,"orgId","019a794a-067a-77b8-af7e-fb3031d870b7","tursoName","tursoHostname","tursoMeasuredAt","pinned","userPerm","r","valPerm","blobPerm","rw","emailPerm","sqlitePerm","projectPerm","telemetryPerm","user",{"_100":99,"_107":103},"org",{"_100":99,"_101":-5,"_102":103,"_19":60,"_104":105,"_106":31},"branch",{"_13":89,"_38":90,"_49":48,"_91":50,"_92":-5,"_93":-5,"_94":-5,"_95":-5,"_96":-5,"_97":51,"_98":99},"isOwned",14,"main","projectId","forkedBranchId","forkedBranchVersion","forkedProjectPrivacy","forkedProjectId","forkedProjectOrgId","projectName","userHandle","recvfrom","handle","displayName","avatar","https://img.clerk.com/eyJ0eXBlIjoicHJveHkiLCJzcmMiOiJodHRwczovL2ltYWdlcy5jbGVyay5kZXYvb2F1dGhfZ2l0aHViL2ltZ18zNU9Cd1BqUjhyWWlQeFpvdjlrcmRHbmJtZEUifQ","tier","free","canRestrictVals","profileImageUrl","branchName","","adoptOrgId",{"_49":50,"_38":51,"_44":169,"_53":-5,"_54":31,"_55":56,"_57":56,"_58":-5,"_59":-5,"_19":60,"_61":-5,"_62":31,"_63":-5,"_64":-5,"_65":66,"_67":68,"_69":-5,"_70":-5,"_71":-5,"_72":-5,"_73":74,"_75":74,"_76":77,"_78":77,"_79":77,"_80":74,"_81":74,"_82":170,"_84":171,"_86":172,"_88":31},"tree",[160,161],"files",[160,161],"counts",{"_149":66,"_150":151,"_152":151,"_153":154,"_155":156},"contents",[131,132],"upstreamProject","upstreamBranch","emptyEnvVars","flags",[],"hasHttpFiles",true,"grants","orgs","customDomains",{},{"_49":140,"_38":141,"_36":142,"_134":-5,"_47":48,"_46":143,"_135":31,"_44":144,"_13":145,"_39":146,"_41":147,"_30":31,"_138":-5,"_33":148},{"_49":133,"_38":34,"_36":37,"_134":-5,"_47":48,"_46":14,"_135":31,"_44":136,"_13":137,"_39":40,"_41":43,"_30":31,"_138":-5,"_33":139},"cf58fa78-382f-11f1-8e50-42b51c65c3df","parentId","latest",["D",1776191341814],2,"label",[34],"b1a8e466-382f-11f1-83e9-42b51c65c3df","main.ts","799b064e-382f-11f1-8e50-42b51c65c3df",4,["D",1776191292020],3,"http","/**\n * DNS-over-HTTPS (DoH) style endpoint.\n * Handles GET /dns-query?dns=\n * Returns a fixed DNS response (NXDOMAIN) with application/dns-message content type.\n */\nexport default async function (req: Request): Promise {\n const url = new URL(req.url);\n\n if (url.pathname !== \"/dns-query\") {\n return new Response(\"Not Found\", { status: 404 });\n }\n\n if (req.method !== \"GET\") {\n return new Response(\"Method Not Allowed\", { status: 405 });\n }\n\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 // Convert base64url to standard base64\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 // Parse the transaction ID and query domain from the request\n // so the response matches the query\n if (queryBytes.length < 12) {\n return new Response(\"DNS query too short\", { status: 400 });\n }\n\n const txId = queryBytes.slice(0, 2); // Transaction ID from the query\n\n // Build a fixed DNS response:\n // - Echoes the transaction ID\n // - QR=1 (response), Opcode=0 (standard), AA=0, TC=0, RD=1, RA=1, RCODE=0 (No Error)\n // - QDCOUNT=1, ANCOUNT=1, NSCOUNT=0, ARCOUNT=0\n // - Echoes the original question section\n // - Returns a fixed A record answer: 93.184.216.34 (example.com's IP) with TTL 300\n\n // Extract the question section from the query (everything after the 12-byte header)\n const questionSection = queryBytes.slice(12);\n\n // Find the end of the QNAME (null-terminated) + QTYPE (2 bytes) + QCLASS (2 bytes)\n let qnameEnd = 12;\n while (qnameEnd < queryBytes.length && queryBytes[qnameEnd] !== 0) {\n qnameEnd++;\n }\n qnameEnd++; // skip the null terminator\n const questionEnd = qnameEnd + 4; // +2 QTYPE +2 QCLASS\n const questionBytes = queryBytes.slice(12, questionEnd);\n\n // DNS header for the response\n const header = new Uint8Array(12);\n header[0] = txId[0]; // Transaction ID\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; // QDCOUNT high\n header[5] = 0x01; // QDCOUNT low = 1\n header[6] = 0x00; // ANCOUNT high\n header[7] = 0x01; // ANCOUNT low = 1\n header[8] = 0x00; // NSCOUNT = 0\n header[9] = 0x00;\n header[10] = 0x00; // ARCOUNT = 0\n header[11] = 0x00;\n\n // Answer section: pointer to QNAME in question + TYPE A + CLASS IN + TTL + RDLENGTH + RDATA\n const answer = new Uint8Array([\n 0xc0, 0x0c, // Name: pointer to offset 12 (the QNAME in the question)\n 0x00, 0x01, // Type: A (1)\n 0x00, 0x01, // Class: IN (1)\n 0x00, 0x00, 0x01, 0x2c, // TTL: 300 seconds\n 0x00, 0x04, // RDLENGTH: 4 bytes\n 93, 184, 216, 34, // RDATA: 93.184.216.34\n ]);\n\n // Combine header + question + answer\n const response = new Uint8Array(header.length + questionBytes.length + answer.length);\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 },\n 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Diff · v7