Agent Ready HTML

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://ubuntu.com/ answered 200 with text/html, 183 KB, read 8 November 2026, 13:48 UTC.

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

The page answers a plain fetch: 5 of 6 checks found.

Initial HTML what a plain fetch receives

<!DOCTYPE html>

<html prefix="og: http://ogp.me/ns#"
      class=""
      lang="en"
      dir="ltr">
  <head>
<meta charset="UTF-8" />
[... 1 more head element folded ...]
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>The enterprise Linux for open source innovation | Ubuntu</title>
[... 9 more head elements folded ...]
<link rel="canonical" href=" 
      https://ubuntu.com/" />
<link rel="alternate"
            type="text/markdown"
            href="https://ubuntu.com/?format=md" />
<link rel="describedby" href="https://ubuntu.com/llms.txt" />
[... 9 more head elements folded ...]
<meta name="description" content=" 
        
  Ubuntu is the modern, enterprise Linux operating system for servers, desktop, cloud, and IoT. Supported for up to 15 years
" />
[... 21 more head elements folded ...]
</head>

        <body class=" 
          
  is-dark
 p-homepage">
          <!-- google tag manager -->
          <noscript>[... 301 characters folded ...]</noscript>
          <!-- end google tag manager -->

          <!-- begin usabilla live embed code -->
<script nonce="ns5BKR-YC_-Wpue4ohOhbg" defer src="/static/js/src/usabilla-loader.js?v=5df61c1"></script>
<!-- end usabilla live embed code -->
          <div id="success" class="p-popup-notification">
  <div class="p-notification--positive u-no-margin--bottom">
    <div class="p-notification__content">
      <p class="p-notification__message">
        Your submission was sent successfully!
        <a href="#" data-js-back><i class="p-notification__close">Close</i></a>
      </p>
    </div>
  </div>
</div>
<div id="contact-form-success" class="p-popup-notification">
  <div class="p-notification--positive u-no-margin--bottom">
    <div class="p-notification__content">
      <p class="p-notification__message">
        Thank you for contacting us. A member of our team will be in touch shortly.
        <a href="#" data-js-back><i class="p-notification__close">Close</i></a>
      </p>
    </div>
  </div>
</div>
<div id="unsubscribed" class="p-popup-notification">
  <div class="p-notification--positive u-no-margin--bottom">
    <div class="p-notification__content">
      <p class="p-notification__message">
        You have successfully unsubscribed!
        <a href="#" data-js-back><i class="p-notification__close">Close</i></a>
      </p>
    </div>
  </div>
</div>
<div id="newsletter-signup" class="p-popup-notification">
  <div class="p-notification--positive u-no-margin--bottom">
    <div class="p-notification__content">
      <p class="p-notification__message">
        Thank you for signing up for our newsletter!
        <br />
        In these regular emails you will find the latest updates about
        Ubuntu and upcoming events where you can meet our team.<a href="#" data-js-back><i class="p-notification__close">Close</i></a>
      </p>
    </div>
  </div>
</div>
<div id="updated" class="p-popup-notification">
  <div class="p-notification--positive u-no-margin--bottom">
    <div class="p-notification__content">
      <p class="p-notification__message">
        Your preferences have been successfully updated. <a href="#" data-js-back><i class="p-notification__close">Close notification</i></a>
      </p>
    </div>
  </div>
</div>
<div id="contact-form-fail" class="p-popup-notification">
  <div class="p-notification--negative u-no-margin--bottom">
    <div class="p-notification__content">
      <p class="p-notification__message">
        
          
          Please try again or 
          <a href="https://github.com/canonical/ubuntu.com/issues/new?template=ISSUE_TEMPLATE.yaml">file a bug report.</a>
        
        <a href="#" data-js-back><i class="p-notification__close">Close</i></a>
      </p>
    </div>
  </div>
</div>

          
            <div class="l-sticky-header">
              
<header id="navigation"
        data-nosnippet
        class="p-navigation--sliding is-dark ">

  
    <div class="p-navigation__row--25-75">
      <div class="p-navigation__banner">
        <div class="p-navigation__tagged-logo">
          <a class="p-navigation__link" href="/">
            
              <div class="p-navigation__logo-tag">
                <img class="p-navigation__logo-icon"
                     src="https://assets.ubuntu.com/v1/82818827-CoF_white.svg"
                     alt="" />
              </div>
              <span class="p-navigation__logo-title">Canonical Ubuntu</span>
            
          </a>
        </div>
        <ul class="p-navigation__items">
          <li class="p-navigation__item">
            <a href="/search"
               class="js-search-button p-navigation__link--search-toggle"
               aria-label="Search"></a>
          </li>
          <li class="p-navigation__item">
            <a href="/navigation" class="js-menu-button p-navigation__link">Menu</a>
          </li>
        </ul>
      </div>
      <nav class="p-navigation__nav js-show-nav" aria-label="Categories">
        <ul class="p-navigation__items" role="menu">
          <li class="p-navigation__item--dropdown-toggle"
              role="none"

Shown with 87 long blocks (scripts, styles, long tags) folded into a marker that says how many characters they hide; the pane stops after the first 200 words; the page is 183 KB.

Reading view the text a plain-fetch client can extract

title: The enterprise Linux for open source innovation | Ubuntu

Enterprise resilience. Developer velocity.

Your submission was sent successfully! Close Thank you for contacting us. A member of our team will be in touch shortly. Close You have successfully unsubscribed! Close Thank you for signing up for our newsletter! In these regular emails you will find the latest updates about Ubuntu and upcoming events where you can meet our team. Close Your preferences have been successfully updated. Close notification Please try again or file a bug report. Close Canonical Ubuntu Menu Products Use cases Support Community Get Ubuntu Careers Register for Ubuntu Summit 26.10 Live on Nov 12-13. Join us in celebrating the world of open source. Learn more &rsaquo; Close Enterprise resilience. Developer velocity. Build with confidence on Ubuntu. The enterprise Linux that delivers the latest and greatest open source with 15 years of support. Download Ubuntu Latest Ubuntu 26.04 LTS Resolute Raccoon is available for download Discover the latest and greatest features in our most recent long term supported release. Download for free Read the deep dive The Standard Support period for Ubuntu 20.04 LTS has ended. Discover your options. Take action today 私たちの日本のウェブサイトを試してみてください &rsaquo; 嗨！你知道我们有中文站吗？立即带我去！ &rsaquo; Performance as standard, across your stack Benefit from an intuitive interface, accessible package ecosystem and

1954 more words follow in the initial HTML.

5 found, 1 missing, 1 note, from 7 checks run

  • H1Found
  • 200 wordsFound
  • llms.txtFound
  • MarkdownMissing
  • Missing pathFound
  • JSON-LDFound
  • OpenAPINote
What a plain fetch found on ubuntu.com
CheckResultDetail
H1 in the initial HTMLFound one H1First H1: Enterprise resilience. Developer velocity.
First 200 words in the initial HTMLFound 200 of 200 wordsThe initial HTML carries 2154 words of visible text; the first 200 are marked in the left pane.
llms.txt present and linkedFound present and linked12879 bytes, 65 links. Structure grade A (6 of 6). The home page links it, which is how agents reached it in Ora's lab.
Markdown on requestMissing 200 text/htmlAccept: text/markdown returned 200 with text/html; charset=utf-8. The server ignores the header.
Status of a made-up pathFound 404/agent-ready-html-missing-path-check returned 404: a real status code for a missing page.
JSON-LD typesFound ImageObject, Organization2 schema.org types in JSON-LD blocks on the home page: ImageObject, Organization.
OpenAPI linkNote none on the home pageNo 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 ubuntu.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

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

Last reviewed 5 November 2026