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://oreilly.com/ answered 200 with text/html, 311 KB, 1 redirect, read 8 November 2026, 13:19 UTC. Final URL: https://www.oreilly.com/.

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

The page answers a plain fetch: 4 of 6 checks found.

Initial HTML what a plain fetch receives

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>O'Reilly Media - Technology and Business Training</title>
<meta name="description" content="Build the skills your teams need. Give them the O'Reilly learning platform and equip them with the resources that drive business outcomes." />
[... 13 more head elements folded ...]
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
[... 3 more head elements folded ...]
<link rel="canonical" href="https://www.oreilly.com/">
[... 19 more head elements folded ...]
</head>
<body class="homepage control">


<!-- Google Tag Manager (noscript) -->
<noscript>[... 138 characters folded ...]</noscript>
<!-- End Google Tag Manager (noscript) -->

<!-- Site navigation -->
<a class="orm-global-skip-link" id="skipToMain" href="#maincontent">Skip to Content</a>

<!-- Global nav CSS -->
<!-- <csinclude record="sc/3103" field="html" /> -->
<link rel="stylesheet" type="text/css" href="https://cdn.oreillystatic.com/assets/css/nav-20260120-s.css" />

<!-- Global nav HTML -->
<header class="orm-global-site-header--auth" id="orm-global-site-banner" role="banner" data-testid="site-header-auth">
  <nav id="orm-global-marketing-nav" data-hidden="sm">
    <ul id="orm-global-marketing-nav__list" role="menu">
      <li class="orm-global-marketing-nav-list__item" role="presentation">
        <a class="orm-global-marketing-nav-list-item__link" role="menuitem" data-gtm='{ "eventCat":"marketing", "eventAct":"nav", "eventLbl":"for enterprise" }' data-gtm-event="mousedown" href="https://www.oreilly.com/online-learning/teams.html">For Enterprise</a>
      </li>
      <li class="orm-global-marketing-nav-list__item" role="presentation">
        <a class="orm-global-marketing-nav-list-item__link" role="menuitem" data-gtm='{ "eventCat":"marketing", "eventAct":"nav", "eventLbl":"for government" }' data-gtm-event="mousedown" href="https://www.oreilly.com/online-learning/government.html">For Government</a>
      </li>
      <li class="orm-global-marketing-nav-list__item" role="presentation">
        <a class="orm-global-marketing-nav-list-item__link" role="menuitem" data-gtm='{ "eventCat":"marketing", "eventAct":"nav", "eventLbl":"for higher ed" }' data-gtm-event="mousedown" href="https://www.oreilly.com/online-learning/academic.html">For Higher Ed</a>
      </li>
      <li class="orm-global-marketing-nav-list__item" role="presentation">
        <a class="orm-global-marketing-nav-list-item__link" role="menuitem" data-gtm='{ "eventCat":"marketing", "eventAct":"nav", "eventLbl":"for individuals" }' data-gtm-event="mousedown" href="https://www.oreilly.com/online-learning/individuals.html">For Individuals</a>
      </li>
      <li class="orm-global-marketing-nav-list__item" role="presentation">
        <a class="orm-global-marketing-nav-list-item__link" role="menuitem" data-gtm='{ "eventCat":"marketing", "eventAct":"nav", "eventLbl":"for content marketing" }' data-gtm-event="mousedown" href="https://www.oreilly.com/content-marketing-solutions.html">For Content Marketing</a>
      </li>
    </ul>
  </nav>
  <div id="orm-global-site-banner__content">
    <div class="orm-global-site-banner__block">
      <button aria-expanded="false" class="orm-global-mobile-toggle" data-mobile-toggle="true" data-testid="navigation-toggle" id="orm-global-site-menu-toggle" aria-label="Toggle site menu" aria-controls="orm-global-mobile-pane--navigation">
        <svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium css-1s0hah4" focusable="false" aria-hidden="true" viewBox="0 0 16 16" fill="none" stroke="var(--orm-modern-dark)" data-closed-icon="true">
          <path d="M1 3H15M1 8H15M1 13H15" stroke-width="2" stroke-linecap="round"></path>
        </svg>
        <svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium css-1s0hah4" focusable="false" aria-hidden="true" viewBox="0 0 8 8" fill="none" data-open-icon="true">[... 784 characters folded ...]</svg>
      </button>
      <a id="orm-global-site-logo-link" href="https://www.oreilly.com" title="home page" aria-current="page">
        <svg id="orm-global-site-logo" viewBox="0 0 137 26" fill="none" xmlns="http://www.w3.org/2000/svg">[... 1,457 characters folded ...]</svg>
      </a>
      <nav data-hidden="sm">
        <ul class="orm-global-site-banner__list" role="menu" id="orm-global-site-navigation-list">
        <li class="orm-global-site-banner__list-item" role="presentation" id="orm-global-site-menu-item--desktop-explore-skills-0" data-level="0">
          <button class="orm-global-site-banner__link" role="menuitem" id="orm-global-site-menu-item-button--desktop-explore-skills-0" data-level="0" data-testid="header-link-0" aria-expanded="false" aria-haspopup="true" aria-controls="orm-global-site-menu-popover--desktop-explore-skills-0">Explore Skills </button>
          <dialog class="orm-global-site-menu__popover" id="orm-global-site-menu-popover--desktop-explore-skills-0" aria-labelledby="orm-global-site-menu-item-button--desktop-explore-skills-0" data-level="1" data-testid="popover|header-item:0">
            <ul class="orm-global-site-menu">
        <li class="orm-global-site-menu__item" role="presentation" id="orm-global-site-menu-item--desktop-cloud-computing-0" data-level="1">
          <button class="orm-global-site-menu__link" role="menuitem" id="orm-global-site-menu-item-button--desktop-cloud-computing-0" data-level="1" data-testid="menu-link|parent-header:0|item:0" aria-expanded="false" aria-haspopup="true" aria-controls="orm-global-site-menu-popover--desktop-cloud-computing-0">Cloud Computing <svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium css-1s0hah4" focusable="false" aria-hidden="true" viewBox="0 0 20 20" fill="none">[... 480 characters folded ...]</svg></button>
          <dialog class="orm-global-site-menu__popover" id="orm-global-site-menu-popover--desktop-cloud-computing-0" aria-labelledby="orm-global-site-menu-item-button--desktop-cloud-computing-0" data-level="2" data-testid="popover|header-item:0">
            <ul class="orm-global-site-menu">
        <li class="orm-global-site-menu__item" role="presentation" id="orm-global-site-menu-item--desktop-microsoft-azure-0" data-level="2">
          <a class="orm-global-site-menu__link" role="menuitem" id="orm-global-site-menu-item-button--desktop-microsoft-azure-0" data-testid="menu-link|parent-submenu:0|item:0" data-gtm='{ "eventCat":"global nav", "eventAct":"navi [... 138 characters folded ...]>Microsoft Azure</a>
        </li>
        <li class="orm-global-site-menu__item" role="presentation" id="orm-global-site-menu-item--desktop-amazon-web-services-aws-1" data-level="2">
          <a class="orm-global-site-menu__link" role="menuitem" id="orm-global-site-menu-item-button--desktop-amazon-web-services-aws-1" data-testid="menu-link|parent-submenu:0|item:1" data-gtm='{ "eventCat":"global nav", "eventAc [... 164 characters folded ...]>Amazon Web Services (AWS)</a>
        </li>
        <li class="orm-global-site-menu__item" role="presentation" id="orm-global-site-menu-item--desktop-google-cloud-2" data-level="2">
          <a class="orm-global-site-menu__link" role="menuitem" id="orm-global-site-menu-item-button--desktop-google-cloud-2" data-testid="menu-link|parent-submenu:0|item:2" data-gtm='{ "eventCat":"global nav", "eventAct":"navigat [... 129 characters folded ...]>Google Cloud</a>
        </li>
        <li class="orm-global-site-menu__item" role="presentation" id="orm-global-site-menu-item--desktop-cloud-migration-3" data-level="2">
          <a class="orm-global-site-menu__link" role="menuitem" id="orm-global-site-menu-item-button--desktop-cloud-migration-3" data-testid="menu-link|parent-submenu:0|item:3" data-gtm='{ "eventCat":"global nav", "eventAct":"navi [... 138 characters folded ...]>Cloud Migration</a>
        </li>
        <li class="orm-global-site-menu__item" role="presentation" id="orm-global-site-menu-item--desktop-cloud-deployment-4" data-level="2">
          <a class="orm-global-site-menu__link" role="menuitem" id="orm-global-site-menu-item-button--desktop-cloud-deployment-4" data-testid="menu-link|parent-submenu:0|item:4" data-gtm='{ "eventCat":"global nav", "eventAct":"nav [... 141 characters folded ...]>Cloud Deployment</a>
        </li>
        <li class="orm-global-site-menu__item" role="presentation" id="orm-global-site-menu-item--desktop-cloud-platforms-5" data-level="2">
          <a class="orm-global-site-menu__link" role="menuitem" id="orm-global-site-menu-item-button--desktop-cloud-platforms-5" data-testid="menu-link|parent-submenu:0|item:5" data-gtm='{ "eventCat":"global nav", "eventAct":"navi [... 138 characters folded ...]>Cloud Platforms</a>
        </li>
            </ul>
            <footer class="orm-global-site-menu__footer">
              <a role="menuitem" class="orm-global-site-menu__view-all" data-gtm='{ "eventCat":"global nav", "eventAct":"navigation", "eventLbl":"topics|view all cloud computing" }' data-gtm-event="mousedown" href="/search/skills/cloud-computing/">
                <div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium css-tvi28v" focusable="false" aria-hidden="true" viewBox="0 0 20 20" fill="none">[... 480 characters folded ...]</svg></div>
                View all
              </a>
            </footer>
          </dialog>
        </li>
        <li class="orm-global-site-menu__item" role="presentation" id="orm-global-site-menu-item--desktop-data-engineering-1" data-level="1">
          <button class="orm-global-site-menu__link" role="menuitem" id="orm-global-site-menu-item-button--desktop-data-engineering-1" data-level="1" data-testid="menu-link|parent-header:0|item:1" aria-expanded="false" aria-haspop [... 83 characters folded ...]>Data Engineering <svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium css-1s0hah4" focusable="false" aria-hidden="true" viewBox="0 0 20 20" fill="none">[... 480 characters folded ...]</svg></button>
          <dialog class="orm-global-site-menu__popover" id="orm-global-site-menu-popover--desktop-data-engineering-1" aria-labelledby="orm-global-site-menu-item-button--desktop-data-engineering-1" data-level="2" data-testid="popover|header-item:1">
            <ul class="orm-global-site-menu">
        <li class="orm-global-site-menu__item" role="presentation" id="orm-global-site-menu-item--desktop-data-warehouse-0" data-level="2">
          <a class="orm-global-site-menu__link" role="menuitem" id="orm-global-site-menu-item-button--desktop-data-warehouse-0" data-testid="menu-link|parent-submenu:1|item:0" data-gtm='{ "eventCat":"global nav", "eventAct":"navig [... 136 characters folded ...]>Data Warehouse</a>
        </li>
        <li class="orm-global-site-menu__item" role="presentation" id="orm-global-site-menu-item--desktop-sql-1" data-level="2">
          <a class="orm-global-site-menu__link" role="menuitem" id="orm-global-site-menu-item-button--desktop-sql-1" data-testid="menu-link|parent-submenu:1|item:1" data-gtm='{ "eventCat":"global nav", "eventAct":"navigation", "ev [... 103 characters folded ...]>SQL</a>
        </li>
        <li class="orm-global-site-menu__item" role="presentation" id="orm-global-site-menu-item--desktop-apache-spark-2" data-level="2">
          <a class="orm-global-site-menu__link" role="menuitem" id="orm-global-site-menu-item-button--desktop-apache-spark-2" data-testid="menu-link|parent-submenu:1|item:2" data-gtm='{ "eventCat":"global nav", "eventAct":"navigat [... 130 characters folded ...]>Apache Spark</a>
        </li>
        <li class="orm-global-site-menu__item" role="presentation" id="orm-global-site-menu-item--desktop-microsoft-sql-server-3" data-level="2">
          <a class="orm-global-site-menu__link" role="menuitem" id="orm-global-site-menu-item-button--desktop-microsoft-sql-server-3" data-testid="menu-link|parent-submenu:1|item:3" data-gtm='{ "eventCat":"global nav", "eventAct": [... 154 characters folded ...]>Microsoft SQL Server</a>
        </li>
        <li class="orm-global-site-menu__item" role="presentation" id="orm-global-site-menu-item--desktop-mysql-4" data-level="2">
          <a class="orm-global-site-menu__link" role="menuitem" id="orm-global-site-menu-item-button--desktop-mysql-4" data-testid="menu-link|parent-submenu:1|item:4" data-gtm='{ "eventCat":"global nav", "eventAct":"navigation", " [... 109 characters folded ...]>MySQL</a>
        </li>
        <li class="orm-global-site-menu__item" role="presentation" id="orm-global-site-menu-item--desktop-kafka-5" data-level="2">
          <a class="orm-global-site-menu__link" role="menuitem" id="orm-global-site-menu-item-button--desktop-kafka-5" data-testid="menu-link|parent-submenu:1|item:5" data-gtm='{ "eventCat":"global nav", "eventAct":"navigation", " [... 109 characters folded ...]>Kafka</a>
        </li>
        <li class="orm-global-site-menu__item" role="presentation" id="orm-global-site-menu-item--desktop-data-lake-6" data-level="2">
          <a class="orm-global-site-menu__link" role="menuitem" id="orm-global-site-menu-item-button--desktop-data-lake-6" data-testid="menu-link|parent-submenu:1|item:6" data-gtm='{ "eventCat":"global nav", "eventAct":"navigation [... 121 characters folded ...]>Data Lake</a>
        </li>
        <li class="orm-global-site-menu__item" role="presentation" id="orm-global-site-menu-item--desktop-streaming-messaging-7" data-level="2">
          <a class="orm-global-site-menu__link" role="menuitem" id="orm-global-site-menu-item-button--desktop-streaming-messaging-7" data-testid="menu-link|parent-submenu:1|item:7" data-gtm='{ "eventCat":"global nav", "eventAct":" [... 157 characters folded ...]>Streaming &amp; Messaging</a>
        </li>
        <li class="orm-global-site-menu__item" role="presentation" id="orm-global-site-menu-item--desktop-nosql-databases-8" data-level="2">
          <a class="orm-global-site-menu__link" role="menuitem" id="orm-global-site-menu-item-button--desktop-nosql-databases-8" data-testid="menu-link|parent-submenu:1|item:8" data-gtm='{ "eventCat":"global nav", "eventAct":"navi [... 139 characters folded ...]>NoSQL Databases</a>
        </li>
        <li class="orm-global-site-menu__item" role="presentation" id="orm-global-site-menu-item--desktop-relational-databases-9" data-level="2">
          <a class="orm-global-site-menu__link" role="menuitem" id="orm-global-site-menu-item-button--desktop-relational-databases-9" data-testid="menu-link|parent-submenu:1|item:9" data-gtm='{ "eventCat":"global nav", "eventAct": [... 154 characters folded ...]>Relational Databases</a>
        </li>
            </ul>
            <footer class="orm-global-site-menu__footer">
              <a role="menuitem" class="orm-global-site-menu__view-all" data-gtm='{ "eventCat":"global nav", "eventAct":"navigation", "eventLbl":"topics|view all data engineering" }' data-gtm-event="mousedown" href="/search/skills/data-engineering/">
                <div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium css-tvi28v" focusable="false" aria-hidden="true" viewBox="0 0 20 20" fill="none">[... 480 characters folded ...]</svg></div>
                View all
              </a>
            </footer>
          </dialog>
        </li>
        <li class="orm-global-site-menu__item" role="presentation" id="orm-global-site-menu-item--desktop-data-science-2" data-level="1">

Shown with 268 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 311 KB.

Reading view the text a plain-fetch client can extract

title: O'Reilly Media - Technology and Business Training

Build the workforce AI demands

Skip to Content For Enterprise For Government For Higher Ed For Individuals For Content Marketing Explore Skills Cloud Computing Microsoft Azure Amazon Web Services (AWS) Google Cloud Cloud Migration Cloud Deployment Cloud Platforms View all Data Engineering Data Warehouse SQL Apache Spark Microsoft SQL Server MySQL Kafka Data Lake Streaming & Messaging NoSQL Databases Relational Databases View all Data Science Pandas R MATLAB SAS D3 Power BI Tableau Statistics Exploratory Data Analysis Data Visualization View all AI & ML Generative AI Machine Learning Artificial Intelligence (AI) Deep Learning Reinforcement Learning Natural Language Processing TensorFlow Scikit-Learn Hyperparameter Tuning MLOps View all Programming Languages Java JavaScript Spring Python Go C# C++ C Swift Rust Functional Programming View all Software Architecture Object-Oriented Distributed Systems Domain-Driven Design Architectural Patterns View all IT/Ops Kubernetes Docker GitHub Terraform Continuous Delivery Continuous Integration Database Administration Computer Networking Operating Systems IT Certifications View all Security Network Security Application Security Incident Response Zero Trust Model Disaster Recovery Penetration Testing / Ethical Hacking Governance Malware Security Architecture Security Engineering Security Certifications View all Design Web Design Graphic Design Interaction Design Film & Video User Experience (UX) Design Process Design Tools View all Business Agile Project Management Product Management Marketing Human

1057 more words follow in the initial HTML.

4 found, 1 missing, 2 notes, from 7 checks run

  • H1Found
  • 200 wordsFound
  • llms.txtNote
  • MarkdownMissing
  • Missing pathFound
  • JSON-LDFound
  • OpenAPINote
What a plain fetch found on oreilly.com
CheckResultDetail
H1 in the initial HTMLFound one H1First H1: Build the workforce AI demands
First 200 words in the initial HTMLFound 200 of 200 wordsThe initial HTML carries 1257 words of visible text; the first 200 are marked in the left pane.
llms.txt present and linkedNote present, not linked18762 bytes, 139 links. Structure grade A (6 of 6). Nothing on the home page points to it. Ora's lab found 86 percent of llms.txt fetches arrived through a link.
Markdown on requestMissing 200 text/htmlAccept: text/markdown returned 200 with text/html. 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 ContactPoint, Corporation, DownloadAction, EntryPoint and 11 more15 schema.org types in JSON-LD blocks on the home page: ContactPoint, Corporation, DownloadAction, EntryPoint, ImageObject, Organization, Person, Place, PostalAddress, QuantitativeValue, SearchAction, SubscribeAction, ViewAction, WebPage, WebSite.
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 oreilly.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