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We keep the first rung that\n * returns something which actually looks like Full-Time.\n */\n\nconst BROWSER_HEADERS: Record = {\n \"User-Agent\":\n \"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36\",\n \"Accept\":\n \"text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8\",\n \"Accept-Language\": \"en-GB,en;q=0.9\",\n \"Sec-Fetch-Dest\": \"document\",\n \"Sec-Fetch-Mode\": \"navigate\",\n \"Sec-Fetch-Site\": \"none\",\n \"Sec-Fetch-User\": \"?1\",\n \"Upgrade-Insecure-Requests\": \"1\",\n};\n\nconst BLOCK_MARKER = \"Attention Required\";\n\nexport type PageFetch = { html: string; via: string };\n\n/** A real Full-Time page has the fixtures table's own column headings in it. */\nfunction looksLikeFullTime(html: string): boolean {\n return /]/i.test(html) && /Date\\s*\\/\\s*Time/i.test(html);\n}\n\nexport async function fetchFullTimePage(url: string): Promise {\n const rungs: Array<[string, () => Promise<{ status: number; html: string }>]> = [\n [\"raw-tls-http1.1\", () => viaRawTls(url)],\n [\"fetch\", () => viaFetch(url)],\n [\"fetch+http1\", () => viaHttp1Client(url)],\n ];\n\n const failures: string[] = [];\n for (const [via, attempt] of rungs) {\n try {\n const { status, html } = await attempt();\n if (status === 200 && looksLikeFullTime(html)) return { html, via };\n const blocked = html.includes(BLOCK_MARKER) ? \" (Cloudflare block page)\" : \"\";\n failures.push(`${via}: HTTP ${status}${blocked}`);\n } catch (err) {\n failures.push(`${via}: ${(err as Error).message}`);\n }\n }\n throw new Error(`could not fetch ${url} — ${failures.join(\"; \")}`);\n}\n\nasync function viaFetch(url: string) {\n const res = await fetch(url, { headers: BROWSER_HEADERS });\n return { status: res.status, html: await res.text() };\n}\n\n/** Deno.createHttpClient is unstable; absent on some runtimes, hence the guard. */\nasync function viaHttp1Client(url: string) {\n const createHttpClient = (Deno as Record).createHttpClient as\n | ((opts: unknown) => { close?: () => void })\n | undefined;\n if (typeof createHttpClient !== \"function\") {\n throw new Error(\"Deno.createHttpClient unavailable\");\n }\n const client = createHttpClient({ http1: true, http2: false });\n try {\n const res = await fetch(url, { headers: BROWSER_HEADERS, client } as RequestInit);\n return { status: res.status, html: await res.text() };\n } finally {\n client.close?.();\n }\n}\n\n/**\n * Last resort: speak HTTP/1.1 by hand with ALPN pinned, which is the one thing\n * that reliably stops the runtime negotiating HTTP/2 and getting us blocked.\n */\nasync function viaRawTls(url: string) {\n const target = new URL(url);\n const conn = await Deno.connectTls({\n hostname: target.hostname,\n port: Number(target.port) || 443,\n alpnProtocols: [\"http/1.1\"],\n });\n try {\n const request = [\n `GET ${target.pathname}${target.search} HTTP/1.1`,\n `Host: ${target.hostname}`,\n ...Object.entries(BROWSER_HEADERS).map(([key, value]) => `${key}: ${value}`),\n \"Accept-Encoding: identity\",\n \"Connection: close\",\n \"\",\n \"\",\n ].join(\"\\r\\n\");\n await writeAll(conn, new TextEncoder().encode(request));\n return parseHttp1Response(await readAll(conn));\n } finally {\n try {\n conn.close();\n } catch {\n // the server closes first on Connection: close\n }\n }\n}\n\nasync function writeAll(conn: Deno.Conn, bytes: Uint8Array) {\n let written = 0;\n while (written < bytes.length) written += await conn.write(bytes.subarray(written));\n}\n\nasync function readAll(conn: Deno.Conn): Promise {\n const parts: Uint8Array[] = [];\n const buffer = new Uint8Array(64 * 1024);\n while (true) {\n const read = await conn.read(buffer);\n if (read === null) break;\n parts.push(buffer.slice(0, read));\n }\n return concat(parts);\n}\n\nconst CRLF = new Uint8Array([13, 10]);\nconst CRLF_CRLF = new Uint8Array([13, 10, 13, 10]);\n\nfunction parseHttp1Response(raw: Uint8Array) {\n const split = indexOfSeq(raw, CRLF_CRLF, 0);\n if (split < 0) throw new Error(\"malformed HTTP response: no header terminator\");\n\n const head = new TextDecoder().decode(raw.subarray(0, split));\n const status = Number(head.split(\"\\r\\n\")[0].split(\" \")[1]);\n let body = raw.subarray(split + CRLF_CRLF.length);\n if (/^transfer-encoding:[ \\t]*chunked/im.test(head)) body = decodeChunked(body);\n\n return { status, html: new TextDecoder(\"utf-8\").decode(body) };\n}\n\nfunction decodeChunked(body: Uint8Array): Uint8Array {\n const chunks: Uint8Array[] = [];\n let pos = 0;\n while (pos < body.length) {\n const eol = indexOfSeq(body, CRLF, pos);\n if (eol < 0) break;\n const header = new TextDecoder().decode(body.subarray(pos, eol));\n const size = parseInt(header.split(\";\")[0].trim(), 16);\n if (!Number.isFinite(size) || size <= 0) break;\n const start = eol + CRLF.length;\n chunks.push(body.subarray(start, start + size));\n pos = start + size + CRLF.length; 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