The Plain Fetch viewer

In short

The viewer requests a URL the way a plain-fetch agent does: no JavaScript, one request for HTML, one for markdown, one for llms.txt and one for a path that should not exist. It shows the initial HTML on the left, the readable text on the right, and seven flags underneath.

Pre-loaded with www.wikipedia.org, read 4 November 2026. Type any public URL to run your own.

GET https://getbootstrap.com/ answered 200 with text/html, 45 KB, read 8 November 2026, 13:23 UTC.

Permalink: /viewer/?url=https://getbootstrap.com/

The page answers a plain fetch: 3 of 6 checks found.

Initial HTML what a plain fetch receives

<!DOCTYPE html>
<html lang="en" data-bs-theme="auto">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Bootstrap · The most popular HTML, CSS, and JS library in the world.
</title>
<meta name="description" content="Powerful, extensible, and feature-packed frontend toolkit. Build and customize with Sass, utilize prebuilt grid system and components, and bring projects to life with powerful JavaScript plugins.">
[... 1 more head element folded ...]
<meta name="generator" content="Astro v7.3.2">
<link rel="canonical" href="https://getbootstrap.com/">
[... 26 more head elements folded ...]
</head>
<body>
<div class="navbar-translucent sticky-top bd-sticky-navbar">
<svg xmlns="http://www.w3.org/2000/svg" class="d-none">[... 22,369 characters folded ...]
</svg>
<div class="skippy visually-hidden-focusable overflow-hidden">
<div class="xl:container"><a class="d-inline-flex p-2 m-1" href="#content">Skip to main content</a>
</div>
</div>
<header class="navbar lg:navbar-expand bd-navbar border-bottom border-inverse border-20">
<nav class="2xl:container bd-gutter flex-wrap lg:flex-nowrap justify-content-start" aria-label="Main navigation">
<div class="d-flex align-items-center gap-2 lg:gap-1"><a class="navbar-brand p-0 me-0 lg:me-2" href="/" aria-label="Bootstrap" style="color: var(--bs-indigo-500);">
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 118 94" role="img" class="d-block my-1" height="32" width="40">[... 943 characters folded ...]
</svg></a><span class="lg:d-none fg-4">/</span>
<div class="nav-item lg:d-none"><button class="nav-link fw-medium d-inline-flex align-items-center gap-1 px-0" type="button" data-bs-toggle="menu" aria-expanded="false">Home
<svg class="bi bi-sm" aria-hidden="true"><use href="#chevron-expand"></use>
</svg></button>
<div class="menu border-keyline"><a class="menu-item active" href="/">Home
<svg class="bi ms-auto" aria-hidden="true"><use href="#check2"></use>
</svg></a><a class="menu-item" href="/docs/6.0/getting-started/install/">Docs</a><a class="menu-item" href="https://icons.getbootstrap.com/" target="_blank" rel="noopener">Icons
<svg class="bi bi-sm ms-auto" aria-hidden="true"><use href="#box-arrow-up-right"></use>
</svg></a><a class="menu-item" href="https://blog.getbootstrap.com/" target="_blank" rel="noopener">Blog
<svg class="bi bi-sm ms-auto" aria-hidden="true"><use href="#box-arrow-up-right"></use>
</svg></a><hr class="menu-divider"><a class="menu-item" href="https://github.com/twbs" target="_blank" rel="noopener">GitHub
<svg class="bi bi-sm ms-auto" aria-hidden="true"><use href="#box-arrow-up-right"></use>
</svg></a><a class="menu-item" href="https://opencollective.com/bootstrap" target="_blank" rel="noopener">OpenCollective
<svg class="bi bi-sm ms-auto" aria-hidden="true"><use href="#box-arrow-up-right"></use>
</svg></a><a class="menu-item" href="https://x.com/getbootstrap" target="_blank" rel="noopener">Twitter/X
<svg class="bi bi-sm ms-auto" aria-hidden="true"><use href="#box-arrow-up-right"></use>
</svg></a>
</div>
</div>
<ul class="nav navbar-nav flex-row d-none lg:d-flex bd-navbar-nav">
<li class="nav-item"><a class="nav-link px-2" href="/docs/6.0/getting-started/install/">Docs</a>
</li>
<li class="nav-item"><a class="nav-link px-2" href="https://github.com/twbs/examples/tree/main" target="_blank" rel="noopener">Examples</a>
</li>
<li class="nav-item"><a class="nav-link px-2" href="https://icons.getbootstrap.com/" target="_blank" rel="noopener">Icons</a>
</li>
<li class="nav-item"><a class="nav-link px-2" href="https://blog.getbootstrap.com/" target="_blank" rel="noopener">Blog</a>
</li>
</ul>
</div>
<ul class="nav navbar-nav flex-row ms-auto">
<li class="bd-search"><button type="button" class="bd-search-trigger" data-bs-toggle="dialog" data-bs-target="#bdSearchDialog" aria-haspopup="dialog" aria-label="Search docs…">
<svg class="bi bd-search-trigger-icon" width="16" height="16" aria-hidden="true"><use href="#search"></use>
</svg><span class="bd-search-trigger-label">Search docs…</span><span class="bd-search-trigger-shortcut" hidden></span></button>
</li>
<li class="nav-item"><a class="nav-link px-2 px-1 d-none lg:d-flex" href="https://github.com/twbs" target="_blank" rel="noopener">
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 499.36" role="img" class="navbar-nav-svg" height="16" width="16">[... 846 characters folded ...]
</svg></a>
</li>
<li class="nav-item"><button type="button" class="btn btn-link nav-link px-1 gap-1" data-bs-toggle="menu" data-bs-placement="bottom-end" aria-expanded="false">v6.0
<svg class="bi bi-sm" aria-hidden="true"><use href="#chevron-expand"></use>
</svg></button>
<div class="menu border-keyline" id="bd-versions-menu">
<h6 class="menu-header">v6 releases
</h6><a class="menu-item active" aria-current="true" href="/">6.0.x <span class="fg-contrast-accent fg-50">(Alpha)</span>
<svg class="bi ms-auto" aria-hidden="true"><use href="#check2"></use>
</svg></a><hr class="menu-divider">
<h6 class="menu-header">Previous releases
</h6><a class="menu-item" href="https://getbootstrap.com/docs/5.3/">v5.3.x<span class="fg-3">(Latest)</span></a><a class="menu-item" href="https://getbootstrap.com/docs/4.6/">v4.6.x</a><a class="menu-item" href="https://getbootstrap.com/docs/3.4/">v3.4.1</a><a class="menu-item" href="https://getbootstrap.com/2.3.2/">v2.3.2</a><hr class="menu-divider"><a class="menu-item" href="/docs/versions/">All versions…</a>
</div>
</li>
<li class="nav-item"><button class="btn btn-link nav-link px-1 gap-1" id="bd-theme" type="button" aria-expanded="false" data-bs-toggle="menu" data-bs-placement="bottom-end" aria-label="Toggle theme (auto)">
<svg class="bi theme-icon-active" aria-hidden="true"><use href="#circle-half"></use>
</svg><span class="visually-hidden">Toggle theme</span>
<svg class="bi bi-sm" aria-hidden="true"><use href="#chevron-expand"></use>
</svg></button>
<div class="menu border-keyline" id="bd-theme-menu" aria-labelledby="bd-theme" style="--bs-menu-min-width: 8rem;"><button type="button" class="menu-item" data-bs-theme-value="light" aria-pressed="false">
<svg class="bi opacity-50" aria-hidden="true"><use href="#sun-fill"></use>
</svg>Light
<svg class="bi ms-auto d-none" aria-hidden="true"><use href="#check2"></use>
</svg></button><button type="button" class="menu-item" data-bs-theme-value="dark" aria-pressed="false">
<svg class="bi opacity-50" aria-hidden="true"><use href="#moon-stars-fill"></use>
</svg>Dark
<svg class="bi ms-auto d-none" aria-hidden="true"><use href="#check2"></use>
</svg></button><button type="button" class="menu-item active" data-bs-theme-value="auto" aria-pressed="true">
<svg class="bi opacity-50" aria-hidden="true"><use href="#circle-half"></use>
</svg>Auto
<svg class="bi ms-auto d-none" aria-hidden="true"><use href="#check2"></use>
</svg></button>
</div>
</li>
</ul>
</nav>
</header><dialog class="dialog dialog-lg dialog-search dialog-scrollable" id="bdSearchDialog" aria-labelledby="bdSearchDialog-label">
<form class="dialog-header bd-search-form" role="search" autocomplete="off"><label class="visually-hidden" id="bdSearchDialog-label" for="bdSearchDialog-input">Search docs…</label><label class="form-control form-adorn"><span class="form-adorn-icon" aria-hidden="true">
<svg class="bi bd-search-form-icon" width="16" height="16" aria-hidden="true"><use href="#search"></use>
</svg></span><bd-search-input><input id="bdSearchDialog-input" type="search" class="form-ghost bd-search-input" placeholder="Search docs…" autocomplete="off" spellcheck="false" enterkeyhint="search"></bd-search-input></label><button type="button" class="btn-close bd-search-close" data-bs-dismiss="dialog" aria-label="Close"></button>
</form>
<div class="dialog-body bd-search-body"><bd-search-results></bd-search-results>
</div></dialog>
<script type="module" src="/docs/6.0/assets/Navigation.astro_astro_type_script_index_0_lang.DDEt4Qt4.js">
</script>
</div>
<div class="bd-masthead mb-3" id="content">
<div class="2xl:container bd-gutter">
<div class="lg:col-10 mx-auto d-flex flex-column gap-5 align-items-center text-center"><a class="badge badge-subtle badge-lg fs-md fw-normal theme-warning border border-bg border-50 rounded-pill gap-1" href="https://www.herodevs.com/support/nes-bootstrap?utm_source=Bootstrap_site&utm_medium=Banner&utm_campaign=v3and4_eol" rel="noopener" target="_blank">Security updates for Bootstrap 3 &amp; 4
<svg class="bi" style="width: 20px; height: 20px;" aria-hidden="true"><use href="#arrow-right-short"></use>
</svg></a>
<div class="d-flex flex-column gap-3">
<h1 class="fw-semibold lh-1 text-balance">Bootstrap is the open source design system for everyone
</h1>
<p class="md:fs-lg fg-2 mb-0 text-balance">Bootstrap 6 has been rebuilt for today's web as a framework-agnostic design toolkit that anyone—human or AI, novice or pro—can use to build anything. New standards, new components, an updated visual design, CSS-first theming, and more powerful JavaScript plugins.<br><a href="https://blog.getbootstrap.com/" class="underline-30">Learn more on the blog.</a>
</p>
</div>
<div class="d-flex flex-column md:flex-row md:align-items-stretch md:my-2 gap-4">
<script type="module" src="/docs/6.0/assets/CodeCopy.astro_astro_type_script_index_0_lang.Dz80MlN5.js">
</script>
<div class="code-copy"><pre class="astro-code astro-code-themes  " style="background-color:light-dark(#ffffff, #0b0c0d);--shiki-light-bg:#ffffff;--shiki-dark-bg:#0b0c0d;color:light-dark(#0b0c0d, #f6f7f8);--shiki-light:#0b0c0d;--shiki-dark:#f6f7f8" tabindex="0"><code><span class="line"><span>npm i bootstrap@6.0.0-alpha.1</span></span></code></pre><button type="button" class="btn btn-xs btn-icon bg-transparent" title="Copy" data-bd-clipboard>
<svg class="bi fs-md" aria-hidden="true"><use href="#copy"></use>
</svg></button>
</div>
<script type="module">[... 380 characters folded ...]
</script><button class="btn-solid btn-styled theme-inverse btn-lg fw-medium" type="button" data-bs-toggle="menu" data-bs-auto-close="outside" data-bs-placement="bottom-end" aria-expanded="false">
<svg class="bi" aria-hidden="true"><use href="#rocket-takeoff-fill"></use>
</svg>For Agents
<svg class="bi me--1" aria-hidden="true"><use href="#chevron-expand"></use>
</svg></button>
<div class="menu border-keyline" style="--bs-menu-min-width: 14rem;"><button class="menu-item" type="button" data-bd-agents-copy data-clipboard-text="npx skills add twbs/bootstrap">Install v6 migration skill
<svg class="bi bi-sm ms-auto" aria-hidden="true"><use href="#copy"></use>
</svg></button><hr class="menu-divider border-keyline"><a class="menu-item" href="/docs/6.0/getting-started/ai"> Bootstrap & AI docs </a><a class="menu-item" href="/docs/6.0/getting-started/ai#skills"> Explore all skills </a><hr class="menu-divider border-keyline"><a class="menu-item" href="https://chatgpt.com/?q=Read%20https%3A%2F%2Fgetbootstrap.com%2Fllms.txt%20so%20I%20can%20ask%20questions%20about%20Bootstrap%206." rel="noopener" target="_blank">Ask ChatGPT
<svg class="bi bi-sm ms-auto fg-3" aria-hidden="true"><use href="#box-arrow-up-right"></use>
</svg></a><a class="menu-item" href="https://claude.ai/new?q=Read%20https%3A%2F%2Fgetbootstrap.com%2Fllms.txt%20so%20I%20can%20ask%20questions%20about%20Bootstrap%206." rel="noopener" target="_blank">Ask Claude
<svg class="bi bi-sm ms-auto fg-3" aria-hidden="true"><use href="#box-arrow-up-right"></use>
</svg></a>
</div>

Shown with 10 long blocks (scripts, styles, long tags) folded into a marker that says how many characters they hide; line breaks added before block tags because the source is minified; the pane stops after the first 200 words; the page is 45 KB.

Reading view the text a plain-fetch client can extract

title: Bootstrap · The most popular HTML, CSS, and JS library in the world.

Bootstrap is the open source design system for everyone

Skip to main content / Home Home Docs Icons Blog GitHub OpenCollective Twitter/X Docs Examples Icons Blog Search docs… v6.0 v6 releases 6.0.x (Alpha) Previous releases v5.3.x(Latest) v4.6.x v3.4.1 v2.3.2 All versions… Toggle theme Light Dark Auto Search docs… Security updates for Bootstrap 3 & 4 Bootstrap is the open source design system for everyone Bootstrap 6 has been rebuilt for today's web as a framework-agnostic design toolkit that anyone—human or AI, novice or pro—can use to build anything. New standards, new components, an updated visual design, CSS-first theming, and more powerful JavaScript plugins. Learn more on the blog. npm i bootstrap@6.0.0-alpha.1 For Agents Install v6 migration skill Bootstrap & AI docs Explore all skills Ask ChatGPT Ask Claude Read the docs Currently v6.0.0-alpha.1· Bootstrap 5 docs · All releases Bootstrap Designed and built with all the love in the world by the Bootstrap team with the help of our contributors . Code licensed MIT , docs CC BY 3.0 . Currently v6.0.0-alpha.1. Links Home Docs Examples Icons Blog Swag Store Guides Getting started Starter template Webpack Parcel Vite Projects Bootstrap 6 Bootstrap 5 Icons Examples repo Community Issues Discussions Corporate sponsors Open Collective Stack Overflow

196 words in all.

3 found, 2 missing, 2 notes, from 7 checks run

H1Found
200 wordsNote
llms.txtFound
MarkdownMissing
Missing pathFound
JSON-LDMissing
OpenAPINote

What a plain fetch found on getbootstrap.com
Check	Result	Detail
H1 in the initial HTML	Found one H1	First H1: Bootstrap is the open source design system for everyone
First 200 words in the initial HTML	Note 196 words	Only 196 words of visible text arrive in the initial HTML. That is a short page, not a shell.
llms.txt present and linked	Found present and linked	26304 bytes, 142 links. Structure grade A (6 of 6). The home page links it, which is how agents reached it in Ora's lab.
Markdown on request	Missing 200 text/html	Accept: text/markdown returned 200 with text/html; charset=utf-8. The server ignores the header.
Status of a made-up path	Found 404	/agent-ready-html-missing-path-check returned 404: a real status code for a missing page.
JSON-LD types	Missing none	No JSON-LD block on the home page. Ora's lab found it made no difference when the answer was already in the HTML; Google says it is not needed for AI features.
OpenAPI link	Note none on the home page	No OpenAPI link on the home page. It matters only for a site that ships an API.

Run the full check

The viewer read one page with four requests. The full check we recommend next is Ora's scan. Its Access layer runs 42 checks worth 30 of its 100 points, among them content without JavaScript, bot detection, llms.txt, markdown on request, JSON-LD and the sitemap (Ora's check catalogue, contract 1.38.0, read 5 November 2026). Open Ora's report for getbootstrap.com.

Limits: Ora reads public URLs only, says two runs of one scan land within a couple of points without publishing repeat-scan data, and keeps the product that fixes what it finds behind a waitlist. Cloudflare's scanner at isitagentready.com is a quick free alternative, and Mintlify's score covers documentation.

What the viewer does

It sends four plain GET requests with the user agent Mozilla/5.0 (compatible; agent-readiness-crawl/1.0): the URL itself, the same URL with Accept: text/markdown, /llms.txt on the same host, and a made-up path at the root. It runs no JavaScript. The left pane is the first bytes of the HTML as text, with long scripts and styles folded into a marker that says how many characters they hide. The H1 and the first 200 words of visible text are marked in both panes. The flags under the panes say what the four responses added up to.

Limits

Ten seconds for all four requests together, 1.5 MB read from the home page, at most five redirects, each one checked again.
http and https only, default ports only. Private, local and internal addresses and names are refused.
Ten runs per address per minute. The counter lives in memory on the edge function, so it is per instance rather than global. Past ten you get a 429 with a Retry-After header.
Results are cached for 24 hours by the response headers. Nothing is written to a database: the viewer keeps the first 200 words and the extracted fields for the length of the request and keeps no page body beyond that.

What it does not tell you

A plain fetch from this server is not a real agent. Bot protection weighs the source address more than the user agent, so a page that answers 200 here can still refuse an agent, and the reverse. Ora's lab found (2026-10-19) that returning 403 to agent user agents and hiding the answer in JavaScript were the only two of 19 configurations that stopped retrieval; the viewer can see the second, and can only hint at the first. The initial HTML reference covers both. The server logs and the published crawler address ranges settle the first.

The seven flags

H1 in the initial HTML: Whether the HTML the server sends already contains an H1. It is the cheapest sign that the page does not depend on scripts to say what it is.
First 200 words in the initial HTML: Whether at least 200 words of visible text arrive in the initial HTML. Under 40 words with an app root element is flagged as a JavaScript shell.
llms.txt present and linked: Whether /llms.txt answers with a plain-text file, whether the home page links it (an anchor, a link element or a Link header), and the structure grade the index uses.
Markdown on request: Whether a request with Accept: text/markdown comes back as text/markdown. Cloudflare Radar found 3.9 percent of scanned top sites passing this at its April 2026 launch.
Status of a made-up path: Whether a path that should not exist returns 404 or 410. A 200 is a soft 404 and reads as a live page.
JSON-LD types: The schema.org types found in JSON-LD blocks on the page. Ora's lab found JSON-LD made no difference when the answer was already in the HTML.
OpenAPI link: Whether the page links an OpenAPI file, by an anchor or a service-desc link relation. It matters only for a site that ships an API.

Sources

Ora: AgentReady launch post (Ora's lab findings) https://ora.ai/blog/agentready-launch, read 4 November 2026
Ora check catalogue, contract 1.38.0 (132 checks, 42 in the Access layer) https://ora.ai/api/checks, read 5 November 2026
Ora home page (the fixing product is behind a waitlist) https://ora.ai/, read 5 November 2026
Ora: Introducing Deep Scan (repeat scans) https://ora.ai/blog/introducing-deep-scan, read 5 November 2026
Ora llms.txt (public URLs only) https://ora.ai/llms.txt, read 5 November 2026
Vercel: Make your site readable by AI agents https://vercel.com/kb/guide/make-your-site-readable-by-ai-agents, read 4 November 2026
llms.txt proposal (llmstxt.org) https://llmstxt.org/, read 4 November 2026

Last reviewed 5 November 2026