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://canonical.com/ answered 200 with text/html, 338 KB, read 8 November 2026, 14:11 UTC.

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

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

Initial HTML what a plain fetch receives

<!DOCTYPE html>

<html lang="en" dir="ltr">

  <head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<meta name="description" content=" 
      
  Drive innovation with trusted enterprise open source from Canonical &mdash; simple, cost-effective, and supported.
" />
[... 2 more head elements folded ...]
<link rel="canonical" href="https://canonical.com/" />
<link rel="alternate" type="text/markdown" href="https://canonical.com/?format=md" />
<link rel="describedby" href="/llms.txt" />
[... 7 more head elements folded ...]
<title>Trusted open source for enterprises | Canonical</title>
[... 28 more head elements folded ...]
</head>

        <body class=" 
          
  is-dark homepage
 l-site">
          <!-- Google Tag Manager (noscript) -->
          <noscript>[... 168 characters folded ...]</noscript>
          <a href="#main-content" class="u-off-screen">Skip to main content</a>

          <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-hide-target="#success"><i class="p-notification__close">Close</i></a>
      </p>
    </div>
  </div>
</div>
<div id="newsletter-signup" class="p-popup-notification" data-nosnippet>
  <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 from Canonical and upcoming events where you can meet our team.<a href="#"
   data-js-hide-target="#newsletter-signup"><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-hide-target="#contact-form-success"><i class="p-notification__close">Close</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">
        
          
          An error occurred while submitting your form.
          Please try again or
          <a href="https://github.com/canonical/canonical.com/issues/new?template=ISSUE_TEMPLATE.md">file a bug report</a>.
        
        <a href="#"
           data-js-hide-target="#contact-form-fail"><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="Canonical" />
          </div>
          <span class="p-navigation__logo-title">Canonical</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"
             id="js-search-button-mobile"></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 js-dropdown-list">
        <li class="p-navigation__item--dropdown-toggle"
            role="menuitem"
            id="products-nav">
          <a class="p-navigation__link js-dropdown-button"
             href="/navigation"
             aria-controls="products-content"
             tabindex="0"
             data-level="0">Products</a>
             <div class="p-navigation__dropdown is-full-width is-collapsed"
     data-level="1"
     id="products-content"
     aria-hidden="true">
  
    <div class="p-navigation__dropdown-content--sliding">
  <ul class="p-list u-no-margin js-dropdown-list">
    <li class="p-navigation__item--dropdown-close" id="products-content-back">
      <a class="p-navigation__link js-back-button js-focus-target"
         aria-controls="products-content"
         href="#products-content-back"
         data-level="1">Back</a>
    </li>
    
      
        <li class="p-navigation__item--dropdown-toggle"
            id="featured-content">
          <a class="p-navigation__link js-dropdown-button js-focus-target"
             href="#featured-menu"
             aria-controls="featured-menu"
             data-level="1">Featured</a>
          <ul class="p-navigation__dropdown js-dropdown-list"
              id="featured-menu"
              aria-hidden="true">

Shown with 109 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 338 KB.

Reading view the text a plain-fetch client can extract

title: Trusted open source for enterprises | Canonical

Trusted open source

Skip to main content Your submission was sent successfully! Close Thank you for signing up for our newsletter! In these regular emails you will find the latest updates from Canonical and upcoming events where you can meet our team. Close Thank you for contacting us. A member of our team will be in touch shortly. Close An error occurred while submitting your form. Please try again or file a bug report . Close Canonical Menu Products Back Featured Back Ubuntu Desktop Fast, modern and secure Linux Ubuntu Server Scalable Linux for the cloud MAAS Bare metal provisioning Snapcraft App store for Linux OpenStack Private cloud provisioning MicroCloud Lightweight, automated clouds Ubuntu Pro Security & compliance subscription Enterprise-grade support 24/7 support for the full-stack Livepatch Stay patched and defer reboots Kubernetes Containerized workloads MLOps Scalable machine learning solutions Juju Orchestration engine for operators Hardware support Ubuntu hardware you can trust Canonical Academy Real-world, industry relevant exams. Ubuntu OS Back Ubuntu Desktop Fast, modern and secure Linux Ubuntu Server Scalable Linux for the cloud Ubuntu Pro Security & compliance subscription Ubuntu Core Embedded Linux FIPS for Ubuntu Secure Linux for government WSL Windows Subsystem for Linux Multipass VMs for Windows, macOS &

3633 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 canonical.com
Check	Result	Detail
H1 in the initial HTML	Found one H1	First H1: Trusted open source
First 200 words in the initial HTML	Found 200 of 200 words	The initial HTML carries 3833 words of visible text; the first 200 are marked in the left pane.
llms.txt present and linked	Found present and linked	27081 bytes, 138 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	Found ImageObject, Organization	2 schema.org types in JSON-LD blocks on the home page: ImageObject, Organization.
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 canonical.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