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.
A plain-fetch client does not get the heading: 3 of 6 checks found.
Initial HTML what a plain fetch receives
<!DOCTYPE html>
<html lang="nl" data-theme="light">
<head>
<meta charSet="utf-8"/>
<meta name="viewport" content="width=device-width, initial-scale=1"/>
[... 4 more head elements folded ...]
<title>Marktplaats - De plek om nieuwe en tweedehands spullen te kopen en verkopen
</title>
<meta http-equiv="X-UA-Compatible" content="IE=edge"/>
<meta http-equiv="Content-Language" content="nl"/>
<meta name="description" content="De grootste advertentiesite van Nederland. Nieuwe en tweedehands goederen en diensten, koopt en verkoopt u op Marktplaats.nl."/>
[... 24 more head elements folded ...]
<link rel="canonical" href="https://www.marktplaats.nl/"/>
[... 10 more head elements folded ...]
<link rel="alternate" href="android-app://nl.marktplaats.android"/>
[... 29 more head elements folded ...]
</head>
<body>
<div class="hz-Page-body hz-Page">
<div class="hz-Page-header" id="header-root">
<header class=" u-stickyHeader" style="height:100%">
<div class="hz-Header">
<div class="hz-Header-ribbonTop">
</div>
<div class="hz-Header-navBar hz-Header-bigger-touchAreas">
<div class="hz-Header-maxWidth">
<h1 class="hz-Title hz-Title--title5"><a class="hz-Link hz-Link--standalone hz-Header-logo" data-role="homepage" aria-label="Homepage" tabindex="0" href="/" role="link"><img src="//www.hzcdn.io/bff/static/vendor/hz-web-ui/mp/assets/brand-logo--nlnl.87cc7b14.svg" class="hz-Header-logo-desktop" alt="Marktplaats Start"/><img src="//www.hzcdn.io/bff/static/vendor/hz-web-ui/mp/assets/brand-logo-coin--nlnl.59cd3dcd.svg" class="hz-Header-logo-mobile" alt="Marktplaats Start"/></a>
</h1><a class="hz-Button hz-Button--primary hz-Header-skipToMain" href="#main-container" data-role="skip-to-main">Ga naar advertenties</a><a class="hz-Button hz-Button--primary hz-Header-skipToFooter" href="#footer-container" data-role="skip-to-footer">Ga naar onderkant pagina</a>
<ul class="hz-Header-links">
<li><a class="hz-Link hz-Link--isolated" tabindex="0" href="https://help.marktplaats.nl/s/" role="link">Help en info</a>
</li>
<li><a class="hz-Link hz-Link--isolated" tabindex="0" href="https://help.marktplaats.nl/s/article/gebruiksvoorwaarden" role="link">Voorwaarden</a>
</li>
<li><a class="hz-Link hz-Link--isolated" tabindex="0" href="https://www.marktplaats.nl/m/veiligheidscentrum/" role="link">Veiligheidscentrum</a>
</li>
</ul>
<ul class="hz-Header-menu" data-role="nav-dropdown-menu">
<li class="hz-hide-custom--messages"><a class="hz-Link hz-Link--isolated" data-sem="messagingDisplayAction" data-role="messaging" title="Berichten" tabindex="0" href="/messages" role="link">
<div class="hz-Button-badge"><i class="hz-Icon hz-Icon--textControlsDefault hz-SvgIcon hz-SvgIconMessages" aria-hidden="true" data-sem="Icon"></i><span class="hz-hide-lte-md">Berichten</span>
</div></a>
</li>
<li><a class="hz-Link hz-Link--isolated" data-role="notifications" title="Meldingen" tabindex="0" href="/notifications" role="button">
<div class="hz-Button-badge"><i class="hz-Icon hz-Icon--textControlsDefault hz-SvgIcon hz-SvgIconNotification" aria-hidden="true" data-sem="Icon"></i><i class="hz-Header-badge hz-Header-badge--signalAction"></i><span class="hz-hide-lte-md">Meldingen</span>
</div></a>
</li>
<li class="hz-hide-gte-lg"><button class="hz-Link hz-Link--isolated" data-role="hamburgerOpen" tabindex="0" type="button" role="link"><i class="hz-Icon hz-Icon--textControlsDefault hz-SvgIcon hz-SvgIconProfile" aria-hidden="true" data-sem="Icon"></i></button>
</li>
<li class="hz-hide-lte-md"><a class="hz-Link hz-Link--isolated" data-role="login" tabindex="0" href="/identity/v2/login?target=" role="link"><i class="hz-Icon hz-Icon--textControlsDefault hz-SvgIcon hz-SvgIconProfile" aria-hidden="true" data-sem="Icon"></i><span>Inloggen</span></a>
</li>
<li><a class="hz-Button hz-Button--primary hz-Button--callToAction" href="https://link.marktplaats.nl/link/placead/start?entryPoint=main" data-role="placeAd" tabindex="0" aria-label="Plaats advertentie"><span class="hz-Button-Icon hz-Button-Icon--start"><i class="hz-Icon hz-SvgIcon hz-SvgIconPinCallToActionForeground" aria-hidden="true" data-sem="Icon"></i></span><span class="hz-hide-lte-md">Plaats advertentie</span></a>
</li>
</ul>
</div>
</div>
<div class="hz-Header-searchBar">
<div class="hz-Header-maxWidth ">
<form class="hz-SearchForm" data-role="searchForm" action="/lrp/api/lrp-url-redirect" method="get">
<div class="hz-SearchFieldset-standard">
<div class="hz-SearchForm-query" data-role="searchForm-query">
<div class="hz-Nav-dropdown hz-Nav-dropdown--full-width hz-Nav-dropdown--closed"><input class="hz-Nav-dropdown-toggle hz-Header-Autocomplete-input" spellCheck="false" data-role="searchForm-autocomplete" aria-label="Dropdown zoekbalk" autoComplete="off" tabindex="0" role="combobox" aria-expanded="fals [... 97 characters folded ...]>
<div id="autocomplete-instructions" style="display:none">Typ om suggesties te zien. Gebruik de pijltjestoetsen om door de suggesties te navigeren en druk op Enter om een optie te selecteren.
</div>
<div aria-live="polite" style="position:absolute;height:0;width:0;overflow:hidden">
</div>
</div>
</div>
</div>
<div class="hz-SearchFieldset-advanced">
<div class="hz-SearchForm-category">
<div class="hz-CustomDropdown" data-role="searchForm-category-menu">
<div class="hz-Custom-dropdown-container is-dirty">
<div class="hz-Input hz-dropdown-trigger" id="categoryId" role="button" aria-haspopup="listbox" aria-label="Alle categorieën… selected, Kies categorie:, collapsed" aria-required="false" tabindex="0" data-testid="dropdown-trigger" data-value="0"><span class="hz-dropdown-value">Alle categorieën…</span><i class="hz-Icon hz-SvgIcon hz-SvgIconArrowDownRegular" aria-hidden="true" data-sem="Icon"></i>
</div>
</div>
</div><input type="hidden" name="categoryId" value="0"/>
</div>
<div id="formPostcode" class="hz-SearchForm-postcode">
<div class="hz-TextField">
<div class="hz-TextField-formControl"><input class="hz-TextField-input" autoComplete="off" placeholder="Postcode" aria-label="Postcode" id="TextField-" type="text" aria-describedby="TextField--Footer-helper-text" aria-invalid="false" name="postcode" value=""/>
</div>
<div class="hz-TextField-footer">
<div>
</div>
<div id="live-announcement" role="alert" aria-live="polite" aria-atomic="true" style="position:absolute;height:0;width:0;overflow:hidden;display:none">
</div>
</div>
</div>
</div>
<div class="hz-SearchForm-distance">
<div class="hz-CustomDropdown" data-role="searchForm-distance-menu">
<div class="hz-Custom-dropdown-container is-dirty">
<div class="hz-Input hz-dropdown-trigger" id="distance" role="button" aria-haspopup="listbox" aria-label="Alle afstanden… selected, Kies afstand:, collapsed" aria-required="false" tabindex="0" data-testid="dropdown-trigger" data-value="0"><span class="hz-dropdown-value">Alle afstanden…</span><i class="hz-Icon hz-SvgIcon hz-SvgIconArrowDownRegular" aria-hidden="true" data-sem="Icon"></i>
</div>
</div>
</div><input type="hidden" name="distance" value="0"/>
</div>
</div><button class="hz-Button hz-Button--secondary hz-SearchForm-search" type="submit" data-role="searchForm-button" tabindex="0"><i class="hz-Icon hz-hide-gte-md hz-SvgIcon hz-SvgIconSearch" aria-hidden="true" data-sem="Icon"></i><span class="hz-show-md">Zoek</span></button>
<div class="hz-SearchForm-options">
</div>
</form>
</div>
</div>
<div class="hz-Header-ribbonBottom">
</div>
</div>
</header>
</div>
<div id="category-menu-bar-root">
<nav class="hz-CategoryMenuBar" role="navigation">
<div class="hz-CategoryMenuBar-topLevel">
<div class="hz-CategoryMenuBar-topLevelItems">
<div class="hz-CategoryMenuBar-expandToggle" aria-haspopup="true" aria-expanded="false" tabindex="0" role="button"><span class="hz-CategoryMenuBar-expandToggleLabel">Alle categorieën</span><i class="hz-Icon hz-CategoryMenuBar-expandToggleIcon hz-SvgIcon hz-SvgIconArrowDownRegular" aria-hidden="true" data-sem="Icon"></i>
</div>
<div class="hz-CategoryMenuBar-Item"><a class="hz-CategoryMenuBarItem-link" href="/cp/speelgoed/" data-ga-track-event="toysClick,CategoryMenuBar"><i class="hz-Icon hz-SvgIcon hz-SvgIconToys" aria-hidden="true" data-sem="Icon"></i>Speelgoed</a>
</div>
<div class="hz-CategoryMenuBar-Item"><a class="hz-CategoryMenuBarItem-link" href="/cp/91/auto-kopen/" data-ga-track-event="carL1Click,"><i class="hz-Icon hz-SvgIcon hz-SvgIcon91" aria-hidden="true" data-sem="Icon"></i>Auto's</a>
</div>
<div class="hz-CategoryMenuBar-Item"><a class="hz-CategoryMenuBarItem-link" href="/cp/504/huis-en-inrichting/"><i class="hz-Icon hz-SvgIcon hz-SvgIcon504" aria-hidden="true" data-sem="Icon"></i>Huis en Inrichting</a>
</div>
<div class="hz-CategoryMenuBar-Item"><a class="hz-CategoryMenuBarItem-link" href="/cp/1847/tuin-en-terras/"><i class="hz-Icon hz-SvgIcon hz-SvgIcon1847" aria-hidden="true" data-sem="Icon"></i>Tuin en Terras</a>
</div>
<div class="hz-CategoryMenuBar-Item"><a class="hz-CategoryMenuBarItem-link" href="/cp/621/kleding-dames/"><i class="hz-Icon hz-SvgIcon hz-SvgIcon621" aria-hidden="true" data-sem="Icon"></i>Kleding | Dames</a>
</div>
<div class="hz-CategoryMenuBar-Item"><a class="hz-CategoryMenuBarItem-link" href="/cp/31/audio-tv-en-foto/"><i class="hz-Icon hz-SvgIcon hz-SvgIcon31" aria-hidden="true" data-sem="Icon"></i>Audio, Tv en Foto</a>
</div>
<div class="hz-CategoryMenuBar-Item"><a class="hz-CategoryMenuBarItem-link" href="/cp/565/kinderen-en-baby-s/"><i class="hz-Icon hz-SvgIcon hz-SvgIcon565" aria-hidden="true" data-sem="Icon"></i>Kinderen en Baby's</a>
</div>
</div>
</div>
</nav>
</div>
<div class="hz-Page-container" id="page-wrapper">
<div class="hz-Page-content">
<section class="hz-Page-element hz-Page-element--full-width" id="top-block-root">
<div id="banner-top-dt-container" class="hz-FeedBannerBlock Banners-module-bannerTopContainer">
<div id="banner-top-dt">
</div>
</div>
</section>
<aside class="hz-Page-element hz-Page-element--aside">
Shown with 19 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 160 KB.
Reading view the text a plain-fetch client can extract
title: Marktplaats - De plek om nieuwe en tweedehands spullen te kopen en verkopen
No H1 in the initial HTML
Ga naar advertenties Ga naar onderkant pagina Help en info Voorwaarden Veiligheidscentrum Berichten Meldingen Inloggen Plaats advertentie Typ om suggesties te zien. Gebruik de pijltjestoetsen om door de suggesties te navigeren en druk op Enter om een optie te selecteren. Alle categorieën… Alle afstanden… Zoek Alle categorieën Speelgoed Auto's Huis en Inrichting Tuin en Terras Kleding | Dames Audio, Tv en Foto Kinderen en Baby's Uitgelicht Auto's >10.000 nieuwe occasions per dag Betalen en Verzenden Snel en eenvoudig geregeld in Berichten Speelgoed De leukste cadeaus volgens kinderen Kopersbescherming Voor extra zekerheid bij verzenden categorieën Antiek en Kunst Audio, Tv en Foto Auto's Auto-onderdelen Auto diversen Boeken Caravans en Kamperen Cd's en Dvd's Computers en Software Contacten en Berichten Diensten en Vakmensen Dieren en Toebehoren Doe-het-zelf en Verbouw Fietsen en Brommers Hobby en Vrije tijd Huis en Inrichting Huizen en Kamers Kinderen en Baby's Kleding | Dames Kleding | Heren Motoren Muziek en Instrumenten Postzegels en Munten Sieraden, Tassen en Uiterlijk Spelcomputers en Games Sport en Fitness Telecommunicatie Tickets en Kaartjes Tuin en Terras Vacatures Vakantie Verzamelen Watersport en Boten Witgoed en Apparatuur Zakelijke goederen Diversen Het Marktplaats Effect Ontdek de impact van tweedehands handelen Kijk in je Wijk Bekijk alle
1245 more words follow in the initial HTML.
| Check | Result | Detail |
|---|---|---|
| H1 in the initial HTML | Missing no H1 | A plain-fetch client finds no page heading in the bytes it receives. |
| First 200 words in the initial HTML | Found 200 of 200 words | The initial HTML carries 1445 words of visible text; the first 200 are marked in the left pane. |
| llms.txt present and linked | Note present, not linked | 9485 bytes, 0 links. Structure grade C (4 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 EntryPoint, ImageObject, Organization, SearchAction and 1 more | 5 schema.org types in JSON-LD blocks on the home page: EntryPoint, ImageObject, Organization, SearchAction, 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 marktplaats.nl.
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