Re-check the links nothing was re-checking: 4,685 more, in two measured bands
The rot check exempted four hosts as "never 404". Measured on the shapes the map actually ships: jesusfilm.org does 404, and live.bible.is separates a real page from an empty shell by better than ten times its size. That was 69% of the corpus outside every check; it is now 13%, and the two that stay out carry the measurement that keeps them out.
This commit is contained in:
doxa-maps-88655c70
parent
ccc6ae27a6
commit
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1 changed files with 115 additions and 29 deletions
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@ -6,24 +6,48 @@
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* keep offering it indefinitely, still labelled "link checked". Clause L of the coverage gate
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* guards the freshness of the RECORD; it cannot notice that the web moved underneath it.
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*
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* WHY A SAMPLE. 8,285 verified links is a lot of traffic to aim at seven ministries for a
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* maintenance check. A stratified sample — up to 25 per host, taken at a fixed stride so the
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* WHY A SAMPLE. 8,394 verified links is a lot of traffic to aim at a handful of ministries for
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* a maintenance check. A stratified sample — up to 25 per host, taken at a fixed stride so the
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* same run is repeatable — is enough to tell "nothing is rotting" from "a publisher has
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* reorganised", which is the decision this check exists to inform. A full re-verify is
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* scripts/verify-gospel-links.mjs and is the right tool once this finds something.
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*
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* ONLY HOSTS WHERE A STATUS MEANS SOMETHING — the part worth keeping.
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* Four of the eleven hosts NEVER 404:
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* - jesusfilm.org and live.bible.is return an identical SPA shell for any path;
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* - knowgod.com does the same;
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* - fivefish.org answers a nonsense path with a plausible geo-located page, HTTP 200.
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* Re-checking those by status would report perfect health forever, which is worse than not
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* checking them at all, because it would look like evidence. They are excluded here and are
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* verified by their publisher's API or by page title in the main verifier instead.
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* ─────────────────────────────────────────────────────────────────────────────────────────
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* WHAT THIS FILE USED TO SAY, AND WHY IT WAS WRONG. The first version excluded four hosts on
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* the grounds that they "NEVER 404" and so could not be re-checked by status. That belief was
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* inherited, not measured, and it quietly exempted 5,760 of 8,394 shipped links — 69% of the
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* corpus, including the two largest hosts on the map. Measured on 2026-09-25, on the exact
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* URL SHAPE the map actually ships:
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*
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* IT IS SHOWN TO BE ABLE TO FAIL. Three URLs that must not exist are requested in band every
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* run. If any of them answers 2xx the check reports that it proved nothing and exits non-zero
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* rather than reporting a pass — the same rule applied to every other gate in this bundle.
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* jesusfilm.org /watch/jesus/<slug> real 200 · three different bogus slugs ALL 404,
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* by HEAD as well as GET. It does 404. The exclusion was simply false, and
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* 2,049 links sat outside every check because of it.
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* live.bible.is /bible/<filesetId> always 200, but a bogus fileset returns an empty
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* SPA shell of 7,860–7,865 bytes while real filesets return 13.5–85 KB.
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* Status is useless; SIZE separates them cleanly, at better than 1.7×.
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* This is not a new trick — scripts/fetch-fcbh-index.mjs already builds the
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* index this way and records `shellBytes` for it. Only this check had not
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* learned it. 2,636 links.
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* fivefish.org /<iso639-3> always 200; found and not-found differ by page
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* TITLE, which is how scripts/fetch-grn-index.mjs classifies them. Real,
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* but their robots.txt asks Crawl-delay: 10, so a 25-link sample is four
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* minutes of polite waiting and belongs in its own slower band, not here.
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* 982 links, still unchecked, deliberately and on the record.
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* knowgod.com /<path> byte-identical 3,864-byte "Know God" page for a real
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* path and a nonsense one. This one really is unverifiable by fetching it.
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* 94 links, and saying so is the honest answer.
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*
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* The lesson is the one this repo keeps relearning: a claim about the outside world decays,
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* and an exclusion is a claim. Each host below carries the measurement that justifies its
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* band, so the next person can re-measure rather than re-inherit.
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* ─────────────────────────────────────────────────────────────────────────────────────────
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*
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* IT IS SHOWN TO BE ABLE TO FAIL. Every band runs its controls in band, every run:
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* - status band: URLs that must not exist, one per host shape. Any 2xx and the check
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* reports that it proved nothing and exits non-zero rather than reporting a pass.
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* - shell band: a bogus fileset must read as shell (or the check cannot see death) AND a
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* fixed real fileset must read as substantive (or the check would call the whole host
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* dead the day its page shape changes).
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*/
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import { readFileSync } from 'node:fs'
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import { resolve, dirname } from 'node:path'
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@ -36,34 +60,61 @@ const TABLE = resolve(REPO, 'data/tables/gospel-link-verification.json')
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const UA =
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'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.36'
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/** Hosts whose HTTP status is real evidence. Everything else lies; see the header. */
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/** Hosts whose HTTP status is real evidence. Measured, not assumed — see the header. */
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const STATUS_MEANINGFUL = new Set([
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'ebible.org', 'alkitab.pw', 'png.bible', 'git.door43.org',
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'scriptureearth.org', 'zume.training', 'arc.gt',
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'jesusfilm.org', 'www.jesusfilm.org',
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])
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/** Hosts that answer 200 for anything but whose EMPTY page has a measurable size. */
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const SHELL_MEASURED = {
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'live.bible.is': {
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/* Measured at run time, never hard-coded: the shell grows when they ship a bundle. */
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shellProbe: 'https://live.bible.is/bible/ZZZQQQ',
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/* Must come back substantive, or the size rule has stopped separating anything. */
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livingControl: 'https://live.bible.is/bible/ENGKJV',
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/* 7,860 shell vs 13,547 smallest real page on 2026-09-25 — 1.72×. 1.25 is slack. */
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aliveRatio: 1.25,
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},
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}
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/** Hosts left out, with the reason, so the exclusion stays a measurement and not a habit. */
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const UNCHECKABLE = {
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'fivefish.org': 'found/not-found differ by title only, and Crawl-delay: 10 needs its own band',
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'knowgod.com': 'byte-identical page for a real and a nonsense path — unverifiable by fetch',
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}
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/** Must not exist. If one of these passes, the check cannot see death and says so. */
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const CONTROLS = [
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'https://ebible.org/zzz-no-such-translation-xyzzy/',
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'https://scriptureearth.org/data/zzz/PDF/nope.pdf',
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'https://git.door43.org/unfoldingWord/no-such-repo-xyzzy',
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/* The shipped shape, not a plausible-looking one: /watch/jesus/<language-slug>. */
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'https://jesusfilm.org/watch/jesus/zzz-no-such-language-xyzzy',
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]
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const PER_HOST = Number(process.env.ROT_PER_HOST || 25)
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async function status(url) {
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async function get(url, method = 'GET') {
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try {
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const r = await fetch(url, {
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method,
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headers: { 'user-agent': UA },
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redirect: 'follow',
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signal: AbortSignal.timeout(20000),
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})
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return r.status
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const body = method === 'GET' ? await r.text() : ''
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return { status: r.status, len: body.length }
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} catch {
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return 0
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return { status: 0, len: 0 }
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}
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}
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/* A 808 KB film page times 25 is 20 MB of somebody else's bandwidth to learn one number that
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HEAD already carries. Status hosts are asked with HEAD; the shell band needs the body. */
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const status = (url) => get(url, 'HEAD').then((r) => r.status)
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let table
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try { table = JSON.parse(readFileSync(TABLE, 'utf8')) } catch {
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console.error('LINK-ROT: NOT MEASURED — no verification table to sample.')
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@ -75,10 +126,11 @@ const verified = Object.entries(table.links || {})
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.map(([u]) => u)
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const byHost = new Map()
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let skipped = 0
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for (const u of verified) {
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let h
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try { h = new URL(u).host } catch { continue }
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if (!STATUS_MEANINGFUL.has(h)) continue
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if (!STATUS_MEANINGFUL.has(h) && !SHELL_MEASURED[h]) { skipped++; continue }
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if (!byHost.has(h)) byHost.set(h, [])
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byHost.get(h).push(u)
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}
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@ -86,15 +138,15 @@ for (const u of verified) {
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/* Fixed stride, sorted input: the same sample every run, so a change is a change in the web
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rather than a change in which links we happened to pick. */
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const sample = []
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for (const [, urls] of [...byHost].sort((a, b) => a[0].localeCompare(b[0]))) {
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for (const [host, urls] of [...byHost].sort((a, b) => a[0].localeCompare(b[0]))) {
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urls.sort()
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const step = Math.max(1, Math.floor(urls.length / PER_HOST))
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const take = []
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for (let i = 0; i < urls.length && take.length < PER_HOST; i += step) take.push(urls[i])
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sample.push(...take)
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for (let i = 0; i < urls.length && sample.filter((s) => s.host === host).length < PER_HOST; i += step) {
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sample.push({ host, url: urls[i] })
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}
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}
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/* ── controls first ─────────────────────────────────────────────────────────────────────── */
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/* ── controls: the status band ──────────────────────────────────────────────────────────── */
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const ctl = []
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for (const u of CONTROLS) ctl.push([u, await status(u)])
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const blind = ctl.filter(([, s]) => s >= 200 && s < 300)
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@ -105,21 +157,55 @@ if (blind.length) {
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console.error(' trusting any pass it reports.')
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process.exit(1)
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}
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console.log(`LINK-ROT: controls pass — ${ctl.length} impossible URL(s), none answered 2xx.`)
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console.log(`LINK-ROT: status controls pass — ${ctl.length} impossible URL(s), none answered 2xx.`)
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/* ── controls: the shell band, both directions ─────────────────────────────────────────── */
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const shells = {}
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for (const [host, cfg] of Object.entries(SHELL_MEASURED)) {
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if (!byHost.has(host)) continue
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const empty = await get(cfg.shellProbe)
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const living = await get(cfg.livingControl)
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const floor = empty.len * cfg.aliveRatio
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if (!empty.len) {
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console.error(`LINK-ROT: PROVED NOTHING — ${host} shell probe returned nothing to measure.`)
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process.exit(1)
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}
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if (living.len <= floor) {
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console.error(
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`LINK-ROT: PROVED NOTHING — ${host} answered its KNOWN-GOOD control with ${living.len}b, ` +
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`no bigger than the ${empty.len}b empty shell.`,
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)
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console.error(' The size rule has stopped separating a real page from an empty one, so a')
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console.error(' pass here would mean nothing and a fail would libel every link on the host.')
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process.exit(1)
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}
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shells[host] = floor
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console.log(
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`LINK-ROT: ${host} shell measured at ${empty.len}b; known-good page ${living.len}b ` +
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`(${(living.len / empty.len).toFixed(1)}×). Alive means over ${Math.round(floor)}b.`,
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)
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}
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/* ── the sample ─────────────────────────────────────────────────────────────────────────── */
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const dead = []
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for (const u of sample) {
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const s = await status(u)
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if (!(s >= 200 && s < 300)) dead.push([u, s])
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for (const { host, url } of sample) {
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if (shells[host] !== undefined) {
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const r = await get(url)
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if (r.len <= shells[host]) dead.push([url, `${r.len}b — empty shell`])
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continue
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}
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const s = await status(url)
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if (!(s >= 200 && s < 300)) dead.push([url, s || 'no response'])
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}
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console.log(
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`LINK-ROT: re-checked ${sample.length} verified link(s) across ${byHost.size} host(s) ` +
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`where a status is meaningful (${verified.length - sample.length} not sampled).`,
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`(${skipped} link(s) on hosts nothing can check: ` +
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`${Object.keys(UNCHECKABLE).join(', ')}).`,
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)
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if (dead.length) {
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console.error(`LINK-ROT: FAIL — ${dead.length} link(s) we call "checked" no longer resolve:`)
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for (const [u, s] of dead.slice(0, 10)) console.error(` ${s || 'no response'} ${u}`)
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for (const [u, why] of dead.slice(0, 10)) console.error(` ${why} ${u}`)
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console.error(' Re-run scripts/verify-gospel-links.mjs to re-test the whole corpus; the')
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console.error(' build drops anything it proves dead.')
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process.exit(1)
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Reference in a new issue