Improve AI agent detection and readability by outputting 200 for page not found (#4164)

This commit is contained in:
Samy Pessé
2026-04-04 12:35:43 +02:00
committed by GitHub
parent 84082225af
commit 50653abd08
10 changed files with 329 additions and 31 deletions
+5
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@@ -0,0 +1,5 @@
---
"gitbook": minor
---
Redirect sitemap.md and .well-known/sitemap.md to llms.txt.
+5
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@@ -0,0 +1,5 @@
---
"gitbook": minor
---
Improve AI agent detection and readability by outputting 200 for page not found.
+12 -3
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@@ -7,7 +7,7 @@
"devDependencies": {
"@biomejs/biome": "^1.9.4",
"@changesets/cli": "^2.30.0",
"turbo": "^2.9.1",
"turbo": "^2.9.2",
"vercel": "50.37.3",
},
},
@@ -139,6 +139,7 @@
"@sindresorhus/fnv1a": "^3.1.0",
"@tailwindcss/container-queries": "^0.1.1",
"@tusbar/cache-control": "^1.0.2",
"@vercel/agent-readability": "^0.2.1",
"ai": "^4.2.2",
"assert-never": "catalog:",
"bidc": "catalog:",
@@ -150,6 +151,7 @@
"js-cookie": "^3.0.5",
"jsontoxml": "^1.0.1",
"jwt-decode": "^4.0.0",
"leven": "^4.1.0",
"mcp-handler": "^1.0.2",
"mdast-util-from-markdown": "^2.0.2",
"mdast-util-frontmatter": "^2.0.1",
@@ -160,7 +162,6 @@
"micromark-extension-frontmatter": "^2.0.0",
"micromark-extension-gfm": "^3.0.0",
"motion": "^12.23.24",
"negotiator": "^1.0.0",
"next": "15.4.11",
"next-themes": "^0.4.6",
"nuqs": "^2.2.3",
@@ -1718,6 +1719,8 @@
"@ungap/structured-clone": ["@ungap/structured-clone@1.2.0", "", {}, "sha512-zuVdFrMJiuCDQUMCzQaD6KL28MjnqqN8XnAqiEq9PNm/hCPTSGfrXCOfwj1ow4LFb/tNymJPwsNbVePc1xFqrQ=="],
"@vercel/agent-readability": ["@vercel/agent-readability@0.2.1", "", { "peerDependencies": { "next": ">=14" }, "optionalPeers": ["next"], "bin": { "agent-readability": "dist/cli/index.cjs" } }, "sha512-ShT7BzIS/dwKompii8tm5do+NR1g4xL5M3wM7S01xsH6yuYQ7wiTPZEcmHMFLHCsAQg45/mD0hgrufpS3NVunw=="],
"@vercel/backends": ["@vercel/backends@0.0.53", "", { "dependencies": { "@vercel/build-utils": "13.12.0", "@vercel/nft": "1.5.0", "execa": "3.2.0", "fs-extra": "11.1.0", "oxc-transform": "0.111.0", "path-to-regexp": "8.3.0", "resolve.exports": "2.0.3", "rolldown": "1.0.0-rc.1", "srvx": "0.8.9", "tsx": "4.21.0", "zod": "3.22.4" }, "peerDependencies": { "typescript": "^4.0.0 || ^5.0.0" } }, "sha512-f8JK9Jatlco6kT/NsLYVR88iqS7oZxUXzXW8TofLmyTT5o+OEXSY2hzAQSjul6r0qz/9yAhtQkMhcHG8Ne01ZQ=="],
"@vercel/blob": ["@vercel/blob@2.3.0", "", { "dependencies": { "async-retry": "^1.3.3", "is-buffer": "^2.0.5", "is-node-process": "^1.2.0", "throttleit": "^2.1.0", "undici": "^6.23.0" } }, "sha512-oYWiJbWRQ7gz9Mj0X/NHFJ3OcLMOBzq/2b3j6zeNrQmtFo6dHwU8FAwNpxVIYddVMd+g8eqEi7iRueYx8FtM0Q=="],
@@ -2612,7 +2615,7 @@
"layout-base": ["layout-base@1.0.2", "", {}, "sha512-8h2oVEZNktL4BH2JCOI90iD1yXwL6iNW7KcCKT2QZgQJR2vbqDsldCTPRU9NifTCqHZci57XvQQ15YTu+sTYPg=="],
"leven": ["leven@4.0.0", "", {}, "sha512-puehA3YKku3osqPlNuzGDUHq8WpwXupUg1V6NXdV38G+gr+gkBwFC8g1b/+YcIvp8gnqVIus+eJCH/eGsRmJNw=="],
"leven": ["leven@4.1.0", "", {}, "sha512-KZ9W9nWDT7rF7Dazg8xyLHGLrmpgq2nVNFUckhqdW3szVP6YhCpp/RAnpmVExA9JvrMynjwSLVrEj3AepHR6ew=="],
"lightningcss": ["lightningcss@1.30.1", "", { "dependencies": { "detect-libc": "^2.0.3" }, "optionalDependencies": { "lightningcss-darwin-arm64": "1.30.1", "lightningcss-darwin-x64": "1.30.1", "lightningcss-freebsd-x64": "1.30.1", "lightningcss-linux-arm-gnueabihf": "1.30.1", "lightningcss-linux-arm64-gnu": "1.30.1", "lightningcss-linux-arm64-musl": "1.30.1", "lightningcss-linux-x64-gnu": "1.30.1", "lightningcss-linux-x64-musl": "1.30.1", "lightningcss-win32-arm64-msvc": "1.30.1", "lightningcss-win32-x64-msvc": "1.30.1" } }, "sha512-xi6IyHML+c9+Q3W0S4fCQJOym42pyurFiJUHEcEyHS0CeKzia4yZDEsLlqOFykxOdHpNy0NmvVO31vcSqAxJCg=="],
@@ -4360,6 +4363,8 @@
"@scalar/object-utils/@scalar/helpers": ["@scalar/helpers@0.1.1", "", {}, "sha512-eJjuCI5djqU0adTwrHvpDf0xuwNRpwZinCfJ03QjnmIFBM9Ch0u3tn/0EZOhcVNbdEyJ+3yvSVy1dCmmvgtpvQ=="],
"@scalar/openapi-parser/leven": ["leven@4.0.0", "", {}, "sha512-puehA3YKku3osqPlNuzGDUHq8WpwXupUg1V6NXdV38G+gr+gkBwFC8g1b/+YcIvp8gnqVIus+eJCH/eGsRmJNw=="],
"@scalar/openapi-types/zod": ["zod@4.1.11", "", {}, "sha512-WPsqwxITS2tzx1bzhIKsEs19ABD5vmCVa4xBo2tq/SrV4RNZtfws1EnCWQXM6yh8bD08a1idvkB5MZSBiZsjwg=="],
"@scalar/postman-to-openapi/@scalar/helpers": ["@scalar/helpers@0.0.12", "", {}, "sha512-4NDmHShyi1hrVRsJCdRZT/FIpy+/5PFbVbQLRYX/pjpu5cYqHBj9s6n5RI6gGDXEBHAIFi63g9FC6Isgr66l1Q=="],
@@ -5418,6 +5423,8 @@
"@scalar/api-client/@scalar/openapi-parser/@scalar/openapi-upgrader": ["@scalar/openapi-upgrader@0.1.3", "", { "dependencies": { "@scalar/openapi-types": "0.5.0" } }, "sha512-iROhcgy3vge6zsviPtoTLHale0nYt1PLhuMmJweQwJ0U23ZYyYhV5xgHtAd0OBEXuqT6rjYbJFvKOJZmJOwpNQ=="],
"@scalar/api-client/@scalar/openapi-parser/leven": ["leven@4.0.0", "", {}, "sha512-puehA3YKku3osqPlNuzGDUHq8WpwXupUg1V6NXdV38G+gr+gkBwFC8g1b/+YcIvp8gnqVIus+eJCH/eGsRmJNw=="],
"@scalar/api-client/@scalar/workspace-store/@scalar/openapi-upgrader": ["@scalar/openapi-upgrader@0.1.3", "", { "dependencies": { "@scalar/openapi-types": "0.5.0" } }, "sha512-iROhcgy3vge6zsviPtoTLHale0nYt1PLhuMmJweQwJ0U23ZYyYhV5xgHtAd0OBEXuqT6rjYbJFvKOJZmJOwpNQ=="],
"@scalar/components/@scalar/oas-utils/@scalar/json-magic": ["@scalar/json-magic@0.6.1", "", { "dependencies": { "@scalar/helpers": "0.0.12", "yaml": "2.8.0" } }, "sha512-HJMPY5dUU3EXVS4EkjAFXo+uCrby/YFu/gljKDQnhYWRy5zQ0sJWrOEDcHS8nLoJRCIRD5tiVpCxnUnSb6OoAQ=="],
@@ -5452,6 +5459,8 @@
"@scalar/import/@scalar/openapi-parser/@scalar/openapi-upgrader": ["@scalar/openapi-upgrader@0.1.3", "", { "dependencies": { "@scalar/openapi-types": "0.5.0" } }, "sha512-iROhcgy3vge6zsviPtoTLHale0nYt1PLhuMmJweQwJ0U23ZYyYhV5xgHtAd0OBEXuqT6rjYbJFvKOJZmJOwpNQ=="],
"@scalar/import/@scalar/openapi-parser/leven": ["leven@4.0.0", "", {}, "sha512-puehA3YKku3osqPlNuzGDUHq8WpwXupUg1V6NXdV38G+gr+gkBwFC8g1b/+YcIvp8gnqVIus+eJCH/eGsRmJNw=="],
"@scalar/postman-to-openapi/@scalar/oas-utils/@scalar/json-magic": ["@scalar/json-magic@0.6.1", "", { "dependencies": { "@scalar/helpers": "0.0.12", "yaml": "2.8.0" } }, "sha512-HJMPY5dUU3EXVS4EkjAFXo+uCrby/YFu/gljKDQnhYWRy5zQ0sJWrOEDcHS8nLoJRCIRD5tiVpCxnUnSb6OoAQ=="],
"@scalar/postman-to-openapi/@scalar/oas-utils/@scalar/object-utils": ["@scalar/object-utils@1.2.8", "", { "dependencies": { "@scalar/helpers": "0.0.12", "flatted": "^3.3.3", "just-clone": "^6.2.0", "ts-deepmerge": "^7.0.1", "type-fest": "5.0.0" } }, "sha512-FjPxEg7Hw0tz2iTKvi+gYt+luZK0TqhX50hUIBuaYa/Ja/OMuKLp9QHhB5U68F1L55CZNP4vwoNNfXeYWnVEZg=="],
+2 -1
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@@ -31,6 +31,7 @@
"@sindresorhus/fnv1a": "^3.1.0",
"@tailwindcss/container-queries": "^0.1.1",
"@tusbar/cache-control": "^1.0.2",
"@vercel/agent-readability": "^0.2.1",
"ai": "^4.2.2",
"assert-never": "catalog:",
"bidc": "catalog:",
@@ -52,7 +53,7 @@
"micromark-extension-frontmatter": "^2.0.0",
"micromark-extension-gfm": "^3.0.0",
"motion": "^12.23.24",
"negotiator": "^1.0.0",
"leven": "^4.1.0",
"next": "15.4.11",
"next-themes": "^0.4.6",
"nuqs": "^2.2.3",
+72
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@@ -7,6 +7,7 @@ import {
import {
extractPagePath,
getSimilarPages,
resolveFirstDocument,
resolvePagePath,
resolvePagePathDocumentOrGroup,
@@ -292,3 +293,74 @@ describe('resolvePagePath', () => {
});
});
});
describe('getSimilarPages', () => {
it('returns the closest matches for a typoed path', () => {
const pages: RevisionPage[] = [
createDocumentPage('install', 'guides/installation'),
createDocumentPage('config', 'guides/configuration'),
createDocumentPage('auth', 'api/authentication'),
];
expect(getSimilarPages(pages, 'guides/installtion', 2).map((page) => page.id)).toEqual([
'install',
'config',
]);
});
it('prefers pages with the same path hierarchy', () => {
const pages: RevisionPage[] = [
createDocumentPage('api-auth', 'api/reference/authentication'),
createDocumentPage('guide-auth', 'guides/authentication'),
createDocumentPage('api-errors', 'api/reference/errors'),
];
expect(
getSimilarPages(pages, 'api/reference/authentcation', 1).map((page) => page.id)
).toEqual(['api-auth']);
});
it('ignores hidden pages', () => {
const pages: RevisionPage[] = [
createDocumentPage('hidden', 'private-api', true),
createDocumentPage('versioned', 'private-api-v2'),
createDocumentPage('public', 'public-api'),
];
const similar = getSimilarPages(pages, 'privte-api', 2);
expect(similar.map((page) => page.id)).toEqual(['versioned', 'public']);
expect(similar.some((page) => page.id === 'hidden')).toBe(false);
});
});
function createDocumentPage(id: string, path: string, hidden = false): RevisionPage {
const slug = path.split('/').at(-1) ?? path;
return {
id,
title: path,
kind: 'sheet',
type: 'document',
hidden,
urls: {
app: `https://app.gitbook.com/s/fvBF1lEt2CVd4RTffSOk/${path}`,
},
path,
slug,
pages: [],
tags: [],
layout: {
cover: true,
coverSize: RevisionPageLayoutOptionsCoverSize.Full,
title: true,
description: true,
tableOfContents: true,
outline: true,
pagination: true,
width: RevisionPageLayoutOptionsWidth.Default,
metadata: true,
tags: true,
},
};
}
+152
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@@ -5,6 +5,7 @@ import {
type RevisionPageGroup,
RevisionPageType,
} from '@gitbook/api';
import leven from 'leven';
import { removeLeadingSlash, removeTrailingSlash } from './paths';
export type AncestorRevisionPage = RevisionPageDocument | RevisionPageGroup;
@@ -208,6 +209,157 @@ export function resolveFirstDocument(
return;
}
/**
* Get a similar pages to a given path. This is used to suggest similar pages when a page is not found.
*/
export function getSimilarPages(
rootPages: RevisionPage[],
pagePath: string,
topK = 5
): RevisionPageDocument[] {
if (topK <= 0) {
return [];
}
const pages = flattenPages(rootPages, (page) => !page.hidden);
if (pages.length === 0) {
return [];
}
const inputPath = createComparablePagePath(pagePath);
if (!inputPath.path) {
return pages.slice(0, topK);
}
const firstPageId = resolveFirstDocument(rootPages, [])?.page.id;
return pages
.map((page, index) => {
const candidatePaths = new Set([page.path]);
if (page.id === firstPageId) {
candidatePaths.add('');
}
let score = 0;
for (const candidatePath of candidatePaths) {
score = Math.max(
score,
scoreComparablePagePaths(inputPath, createComparablePagePath(candidatePath))
);
}
return { page, index, score };
})
.sort((left, right) => right.score - left.score || left.index - right.index)
.slice(0, topK)
.map(({ page }) => page);
}
type ComparablePagePath = {
path: string;
segments: string[];
tokens: string[];
lastSegment: string;
};
function createComparablePagePath(path: string): ComparablePagePath {
const normalizedPath = removeTrailingSlash(removeLeadingSlash(path.trim().toLowerCase()))
.split('/')
.filter(Boolean)
.join('/');
const segments = normalizedPath ? normalizedPath.split('/') : [];
const tokens = segments.flatMap((segment) => segment.split(/[-_\s]+/g)).filter(Boolean);
return {
path: normalizedPath,
segments,
tokens,
lastSegment: segments.at(-1) ?? normalizedPath,
};
}
function scoreComparablePagePaths(
inputPath: ComparablePagePath,
candidatePath: ComparablePagePath
): number {
const fullPathSimilarity = getLevenshteinSimilarity(inputPath.path, candidatePath.path);
const segmentSimilarity = getAlignedSegmentSimilarity(
inputPath.segments,
candidatePath.segments
);
const lastSegmentSimilarity = getLevenshteinSimilarity(
inputPath.lastSegment,
candidatePath.lastSegment
);
const tokenOverlap = getJaccardSimilarity(inputPath.tokens, candidatePath.tokens);
let score =
fullPathSimilarity * 0.4 +
segmentSimilarity * 0.3 +
lastSegmentSimilarity * 0.2 +
tokenOverlap * 0.1;
if (
candidatePath.path &&
(inputPath.path.startsWith(`${candidatePath.path}/`) ||
candidatePath.path.startsWith(`${inputPath.path}/`))
) {
score += 0.05;
}
if (inputPath.lastSegment && inputPath.lastSegment === candidatePath.lastSegment) {
score += 0.1;
}
return score;
}
function getAlignedSegmentSimilarity(left: string[], right: string[]): number {
const length = Math.max(left.length, right.length);
if (length === 0) {
return 1;
}
let score = 0;
for (let index = 0; index < length; index += 1) {
score += getLevenshteinSimilarity(left[index] ?? '', right[index] ?? '');
}
return score / length;
}
function getJaccardSimilarity(left: string[], right: string[]): number {
const leftSet = new Set(left);
const rightSet = new Set(right);
const union = new Set([...leftSet, ...rightSet]);
if (union.size === 0) {
return 1;
}
let intersection = 0;
for (const token of leftSet) {
if (rightSet.has(token)) {
intersection += 1;
}
}
return intersection / union.size;
}
function getLevenshteinSimilarity(left: string, right: string): number {
if (left === right) {
return 1;
}
const maxLength = Math.max(left.length, right.length);
if (maxLength === 0) {
return 1;
}
return 1 - leven(left, right) / maxLength;
}
function resolvePageDocument(
page: RevisionPage,
ancestors: AncestorRevisionPage[]
+9 -17
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@@ -3,7 +3,7 @@ import {
SiteInsightsDisplayContext,
SiteInsightsLLMSVariant,
} from '@gitbook/api';
import Negotiator from 'negotiator';
import { shouldServeMarkdown } from '@vercel/agent-readability';
import type { NextRequest } from 'next/server';
import { NextResponse } from 'next/server';
import rison from 'rison';
@@ -640,6 +640,10 @@ const RSS_PATH_REGEX = /^((\S+)\/)?rss\.xml$/;
const MARKDOWN_PATH_REGEX = /\.md$/;
const LLMS_FULL_PATH_REGEX = /^llms-full\.txt\/\d+$/;
const EMBED_PAGE_PATH_REGEX = /^~gitbook\/embed\/page(\/(\S*))?$/;
const PATH_ALIASES: Record<string, string> = {
'sitemap.md': 'llms.txt',
'.well-known/sitemap.md': 'llms.txt',
};
/**
* Encode path in a site content.
@@ -653,7 +657,7 @@ function encodePathInSiteContent(
routeType?: 'static' | 'dynamic';
events?: ServerInsightsEventInput[] | undefined;
} {
const pathname = removeLeadingSlash(removeTrailingSlash(rawPathname));
let pathname = removeLeadingSlash(removeTrailingSlash(rawPathname));
if (pathname.match(/^~gitbook\/ogimage\/\S+$/)) {
return { pathname };
@@ -701,6 +705,7 @@ function encodePathInSiteContent(
};
}
pathname = PATH_ALIASES[pathname] || pathname;
switch (pathname) {
case '~gitbook/embed':
case '~gitbook/embed/assistant':
@@ -740,9 +745,9 @@ function encodePathInSiteContent(
// PDF, search and auth routes are always dynamic as they depend on the request.
return { pathname, routeType: 'dynamic' };
default: {
// If the pathname is a markdown file or the request is accepting markdown,
// If the pathname is a markdown file or the request is ing markdown,
// we rewrite it to ~gitbook/markdown/:pathname
if (pathname.match(MARKDOWN_PATH_REGEX) || isMarkdownPreferred(request)) {
if (pathname.match(MARKDOWN_PATH_REGEX) || shouldServeMarkdown(request).serve) {
const pagePathWithoutMD = pathname.replace(MARKDOWN_PATH_REGEX, '');
return {
pathname: `~gitbook/markdown/${encodePagePath(pagePathWithoutMD)}`,
@@ -797,16 +802,3 @@ async function writeResponseCookies<R extends NextResponse>(
return response;
}
const MARKDOWN_MEDIA_TYPES = ['text/markdown'];
/**
* Test if a request is requesting a markdown version of the page.
*/
function isMarkdownPreferred(request: Request): boolean {
const negotiator = new Negotiator({
headers: Object.fromEntries(request.headers.entries()),
});
const mediaTypes = negotiator.mediaTypes();
return MARKDOWN_MEDIA_TYPES.some((mediaType) => mediaTypes.includes(mediaType));
}
+41 -10
View File
@@ -1,7 +1,7 @@
import type { GitBookSiteContext } from '@/lib/context';
import { DataFetcherError, getExposableError } from '@/lib/data';
import { getExposableError } from '@/lib/data';
import { getMarkdownForPage } from '@/lib/markdownPage';
import { resolvePagePathDocumentOrGroup } from '@/lib/pages';
import { getSimilarPages, resolvePagePathDocumentOrGroup } from '@/lib/pages';
/**
* Serve a markdown version of a page.
@@ -11,17 +11,14 @@ export async function servePageMarkdown(context: GitBookSiteContext, pagePath: s
try {
const pageLookup = resolvePagePathDocumentOrGroup(context.revision.pages, pagePath);
if (!pageLookup) {
throw new DataFetcherError(`Page "${pagePath}" not found`, 404);
// Generates a markdown body for missing pages. Return this with a 200 status (not 404) because agents discard 404 response bodies.
const md = generateNotFoundMarkdown(context, pagePath);
// Return as 200 so agents read the body
return serveMarkdown(md);
}
const markdown = await getMarkdownForPage(context, pageLookup);
return new Response(markdown, {
headers: {
'Content-Type': 'text/markdown; charset=utf-8',
'X-Robots-Tag': 'noindex',
},
});
return serveMarkdown(markdown);
} catch (error) {
const exposable = getExposableError(error);
return new Response(exposable.message, {
@@ -32,3 +29,37 @@ export async function servePageMarkdown(context: GitBookSiteContext, pagePath: s
});
}
}
function generateNotFoundMarkdown(context: GitBookSiteContext, pagePath: string) {
const similarPages = getSimilarPages(context.revision.pages, pagePath, 5);
const sitemapUrl = context.linker.toAbsoluteURL(context.linker.toPathInSite('sitemap.md'));
const fullContentUrl = context.linker.toAbsoluteURL(
context.linker.toPathInSite('llms-full.txt')
);
return `# Page Not Found
The URL \`${pagePath}\` does not exist.
You might be looking for one of these pages:
${similarPages.map((page) => `- [${page.title}](${context.linker.toAbsoluteURL(context.linker.toPathInSpace(page.path))}.md)`).join('\n')}
## How to find the correct page
1. **Browse the full index**: [/sitemap.md](${sitemapUrl}) - Complete documentation index
2. **View the full content**: [/llms-full.txt](${fullContentUrl}) - Full content export
## Tips for requesting documentation
- For markdown responses, append \`.md\` to URLs (e.g., \`${context.linker.toPathInSpace(similarPages[0]?.path ?? 'docs/example')}.md\`)
- Use \`Accept: text/markdown\` header for content negotiation`;
}
function serveMarkdown(markdown: string) {
return new Response(markdown, {
headers: {
'Content-Type': 'text/markdown; charset=utf-8',
'X-Robots-Tag': 'noindex',
},
});
}
+20
View File
@@ -26,6 +26,26 @@ describe('llms.txt', () => {
expect(response.headers.get('content-type')).toContain('text/markdown');
expect(await response.text()).toContain('# E2E Tests GitBook Open');
});
it('should expose llms.txt from sitemap.md', async () => {
const response = await fetch(
getContentTestURL('https://gitbook.gitbook.io/test-gitbook-open/sitemap.md')
);
expect(response.status).toBe(200);
expect(response.headers.get('content-type')).toContain('text/markdown');
expect(await response.text()).toContain('# E2E Tests GitBook Open');
});
it('should expose llms.txt from .well-known/sitemap.md', async () => {
const response = await fetch(
getContentTestURL('https://gitbook.gitbook.io/test-gitbook-open/.well-known/sitemap.md')
);
expect(response.status).toBe(200);
expect(response.headers.get('content-type')).toContain('text/markdown');
expect(await response.text()).toContain('# E2E Tests GitBook Open');
});
});
describe('llms-full.txt', () => {
+11
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@@ -27,3 +27,14 @@ it('should expose a markdown page with the accept header', async () => {
expect(response.headers.get('x-robots-tag')).toBe('noindex');
expect(await response.text()).toContain('# Text page');
});
it('should should return a 200 for a page not found', async () => {
const response = await fetch(
getContentTestURL('https://gitbook.gitbook.io/test-gitbook-open/missing-page.md')
);
expect(response.status).toBe(200);
expect(response.headers.get('content-type')).toContain('text/markdown');
expect(response.headers.get('x-robots-tag')).toBe('noindex');
expect(await response.text()).toContain('# Page Not Found');
});