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.
The page answers a plain fetch: 4 of 6 checks found.
Initial HTML what a plain fetch receives
<!DOCTYPE html>
<html lang="en-US" class="no-js">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
[... 1 more head element folded ...]
<meta name='robots' content='index, follow, max-image-preview:large, max-snippet:-1, max-video-preview:-1' />
[... 3 more head elements folded ...]
<meta name="description" content="StackAdapt is the AI advertising platform that helps marketers orchestrate audiences, creative, channels, and measurement from one platform with AI built into every stage of advertising." />
<link rel="canonical" href="https://www.stackadapt.com" />
[... 18 more head elements folded ...]
<title>AI Advertising Platform | StackAdapt</title>
[... 2 more head elements folded ...]
<link rel="alternate" type="application/rss+xml" title="StackAdapt » Feed" href="https://www.stackadapt.com/main/feed" />
[... 2 more head elements folded ...]
<link rel="alternate" title="oEmbed (JSON)" type="application/json+oembed" href="https://www.stackadapt.com/main/wp-json/oembed/1.0/embed?url=https%3A%2F%2Fwww.stackadapt.com%2Fmain%2Fhomepage" />
<link rel="alternate" title="oEmbed (XML)" type="text/xml+oembed" href="https://www.stackadapt.com/main/wp-json/oembed/1.0/embed?url=https%3A%2F%2Fwww.stackadapt.com%2Fmain%2Fhomepage&format=xml" />
[... 91 more head elements folded ...]
</head>
<body class="wp-singular page-template page-template-top-sticky-banner page page-id-3748 wp-custom-logo wp-embed-responsive wp-theme-stackadapt">
<!-- Google Tag Manager (noscript) --><noscript>[... 143 characters folded ...]</noscript>
<a class="skip-link screen-reader-text" id="wp-skip-link" href="#wp--skip-link--target">Skip to content</a><div class="wp-site-blocks">
<div class="wp-block-group is-layout-flow wp-block-group-is-layout-flow" style="margin-top:0px;margin-bottom:0px;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px">
<div class="wp-block-sta-pencil-banner">
<div class="sta-pencil-banner__inner">
<p class="sta-pencil-banner__copy">Big advertising goals? Find the right plan to match.</p>
<a
class="sta-pencil-banner__cta"
href="https://www.stackadapt.com/plans-and-packages"
data-gtm-event="cta_click"
data-gtm-click-location="top_pencil_banner"
>
<span class="sta-pencil-banner__cta-label">Explore our Plans & Packages</span>
<span class="sta-pencil-banner__icon" aria-hidden="true">
<svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" aria-hidden="true">
<path d="M18.59 11.59L13 17.17V3H11V17.17L5.41 11.59L4 13L12 21L20 13L18.59 11.59Z" />
</svg>
</span>
</a>
</div>
</div>
<header class="wp-block-template-part">
<div class="wp-block-group has-black-background-color has-background has-global-padding is-layout-constrained wp-container-core-group-is-layout-95ac4e51 wp-block-group-is-layout-constrained" style="padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px">
<div class="wp-block-group is-horizontal is-content-justification-space-between is-nowrap is-layout-flex wp-container-core-group-is-layout-720518e1 wp-block-group-is-layout-flex">
<div class="wp-block-group menu-header-image-container is-nowrap is-layout-flex wp-container-core-group-is-layout-6c531013 wp-block-group-is-layout-flex">
<div class="wp-block-group is-logo-group has-global-padding is-layout-constrained wp-block-group-is-layout-constrained">
<figure class="wp-block-image size-full"><a href="https://www.stackadapt.com/"><img decoding="async" width="130" height="32" fetchpriority="high" loading="eager" src="https://d343x6qscsp61h.cloudfront.net/sites/3/20260723213925/StackAdapt_Logo_StackAdapt_LogoWordmark_250px-1.svg" alt="StackAdapt home" class="wp-image-22216"/></a></figure>
</div>
<div class="wp-block-group has-black-background-color has-background is-layout-flow wp-block-group-is-layout-flow"><div class="sta-custom-menu">
<input
type="checkbox"
tabindex="-1"
id="sta-menu-5"
class="sta-menu-toggle sr-only sta-prevent-scroll-up"
data-desktop-breakpoint="1200"
aria-label="Toggle navigation menu"
/>
<label
for="sta-menu-5"
class="hamburger-icon cursor-pointer z-20 flex items-center justify-center"
role="button"
aria-label="Toggle navigation menu"
tabindex="0"
>
<span class="sr-only">Toggle navigation menu</span>
<svg class="hamburger-open-icon" width="24" height="20" viewBox="0 0 24 20" fill="none" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false">[... 210 characters folded ...]</svg>
<svg class="hamburger-close-icon" width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false">[... 241 characters folded ...]</svg>
</label>
<input
type="radio"
id="submenu-toggle-none"
name="submenu-toggle"
class="sta-submenu-radio-none sr-only sta-prevent-scroll-up"
aria-label="Close submenu"
checked
tabindex="-1"
>
<label for="submenu-toggle-none" class="sta-submenu-overlay">
<span class="sr-only">Close submenu</span>
</label>
<ul class="sta-custom-menu__parent hidden wp-block-sta-menu">
<li class="wp-block-sta-menu-item sta-custom-menu__parent-item flex items-center">
<!-- Radios keep the existing open/close styles. They are not tab stops. -->
<input type="radio" id="submenu-toggle-6" name="submenu-toggle" class="sta-submenu-radio peer/submenu-toggle sr-only sta-prevent-scroll-up" tabindex="-1" aria-hidden="true" />
<input type="radio" id="submenu-toggle-6-none" name="submenu-toggle" class="sr-only sta-prevent-scroll-up" tabindex="-1" aria-hidden="true" />
<button type="button" class="sta-custom-menu__parent-item__title relative flex gap-x-1 pt-[27px] pb-[28px] h-[70px] cursor-pointer text-sta-white-100 text-[18px] font-medium leading-[20px] -tracking-[0.32px] no-underline [... 297 characters folded ...]>
<span class="sta-custom-menu__parent-item__label font-semibold transition-colors duration-300">Platform</span>
</button>
<span class='chevron-icon-wrapper cursor-pointer size-[1.125rem] inline-flex justify-center'>
<svg
xmlns="http://www.w3.org/2000/svg"
viewBox="0 0 24 24"
fill="#fff"
class="chevron-icon transition-all duration-300"
>
<path
d='M6.41 8.59009L5 10.0001L12 17.0001L19 10.0001L17.59 8.59009L12 14.1701L6.41 8.59009Z'/>
</svg>
</span>
<ul id="submenu-toggle-6-panel" class="sta-custom-menu__submenu absolute left-0 rounded-[10px] border border-[#242A31] w-[1065px] max-h-[316px] bg-sta-gray-600 invisible fixed top-[86px] flex justify-center gap-x-8 z-10 peer-checked/submenu-toggle:visible">
<div class="wp-block-columns is-layout-flex wp-container-core-columns-is-layout-28f84493 wp-block-columns-is-layout-flex">
<div class="wp-block-column is-layout-flow wp-block-column-is-layout-flow" style="flex-basis:225px">
<div class="wp-block-group featured-card is-layout-flow wp-block-group-is-layout-flow">
<p class="wp-block-paragraph">Feature</p>
<figure class="wp-block-image size-full"><img decoding="async" width="450" height="226" loading="lazy" src="https://d343x6qscsp61h.cloudfront.net/sites/3/20261019203006/PLG-nav-1.webp" alt="A graphic illustrating StackAdapts plans" class="wp-image-54372" srcset [... 266 characters folded ...]></figure>
<h6 class="wp-block-heading"><a href="https://www.stackadapt.com/plans-and-packages" data-type="page" data-id="20928">Plans & Packages</a></h6>
<p class="wp-block-paragraph">Flexible plans tailored to your advertising needs.</p>
</div>
</div>
<div class="wp-block-column is-layout-flow wp-block-column-is-layout-flow" style="flex-basis:300px">
<p class="wp-block-paragraph">Our Platform</p>
<hr class="wp-block-separator has-alpha-channel-opacity"/>
Shown with 191 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 348 KB.
Reading view the text a plain-fetch client can extract
title: AI Advertising Platform | StackAdapt
The AI platform for every stage of advertising
Skip to content Big advertising goals? Find the right plan to match. Explore our Plans & Packages Toggle navigation menu Close submenu Platform Feature Plans & Packages Flexible plans tailored to your advertising needs. Our Platform StackAdapt Marketing Platform Ivy Studio Partner Program Plans and Packages Channels Connected TV Digital Out-of-Home Email Direct Mail Audio Video Native Display In-Game ChatGPT Ads Solutions Feature Cross-Channel Attribution See how every channel contributes to conversion. Solutions Find the Right Solution Creative Studio Client Services StackAdapt API Industries B2B Political Retail Travel Healthcare Finance Regulated See All Industries About Us Feature Innovation Forum 2026 Explore how AI is reshaping advertising. Register now. Discover More About Us Best DSP Events Media Center StackAdapt News Media Archives Media Kit Careers StackAdapt Careers Job Openings Contact Us Contact Us Request a Demo Sign Up Resources Feature The State of Programmatic Advertising See what top-performing marketers are doing differently. Resources Blog Guides and Reports Podcast Webinars StackAdapt Academy See All Resources Case Studies Latest Case Studies See All Case Studies Log In Request a Demo Sign Up The AI platform for every stage of advertising The future of advertising is connected. StackAdapt connects planning, audiences, creative, channels, and
1121 more words follow in the initial HTML.
| Check | Result | Detail |
|---|---|---|
| H1 in the initial HTML | Found one H1 | First H1: The AI platform for every stage of advertising |
| First 200 words in the initial HTML | Found 200 of 200 words | The initial HTML carries 1321 words of visible text; the first 200 are marked in the left pane. |
| llms.txt present and linked | Note present, not linked | 21721 bytes, 69 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 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, ReadAction, WebPage and 1 more | 5 schema.org types in JSON-LD blocks on the home page: ImageObject, Organization, ReadAction, WebPage, WebSite. |
| 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 stackadapt.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