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: 2 of 6 checks found.
Initial HTML what a plain fetch receives
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
[... 1 more head element folded ...]
<meta name="description"
content="Flightradar24 is the best live flight tracker that shows air traffic in real time. Best coverage and cool features!">
<link rel="canonical" href="https://www.flightradar24.com">
<meta name="viewport"
content="shrink-to-fit=no,initial-scale=1,width=device-width,user-scalable=yes,maximum-scale=5.0">
[... 37 more head elements folded ...]
<link rel="alternate icon" sizes="192x192" type="image/png"
href="https://www.flightradar24.com/static/favicons/android-icon-192x192.png?t=1759238391">
<link rel="alternate icon" sizes="96x96" type="image/png"
href="https://www.flightradar24.com/static/favicons/android-icon-96x96.png?t=1759238391">
<link rel="alternate icon" sizes="32x32" type="image/png"
href="https://www.flightradar24.com/static/favicons/android-icon-32x32.png?t=1759238391">
<link rel="alternate icon" sizes="16x16" type="image/png"
href="https://www.flightradar24.com/static/favicons/android-icon-16x16.png?t=1759238391">
[... 19 more head elements folded ...]
<title inertia>Flightradar24: Live Flight Tracker - Real-Time Flight Tracker Map | Flightradar24
</title>
[... 1 more head element folded ...]
</head>
<body class="antialiased">
<div id="app" data-page="{"component":"MapPage","props":{"errors":{},"name":"Flightradar24 API","route":{"name":"web.map","pa [... 11385 characters folded ...]><!--[--><!----><!----><!--[-->
<div class="flex h-full flex-col" tailwind="antialiased">
<div class="relative flex flex-1 overflow-hidden"><!--[--><!--teleport start--><!--teleport end--><!--[-->
<div class="fixed inset-0 z-sidemenu flex overflow-hidden" data-testid="sidemenu-content" style="display:none;">
<div class="fixed inset-0 bg-black/25" style="">
</div>
<aside id="aside-main-menu" class="max-w-72 absolute inset-y-0 right-0 flex w-full flex-1 flex-col overflow-y-auto bg-gray-1400 sm:max-w-sidebar lg:overflow-hidden" style="display:none;">
<div class="flex-1 lg:h-0 lg:overflow-y-scroll"><button id="aside-main-menu-close-button" class="mb-2.5 ml-auto block p-4 focus:ring-0 md:focus-visible:ring-2">
<svg xmlns="http://www.w3.org/2000/svg" fill="currentColor" viewBox="0 0 24 24" class="fill-current size-4 text-white">[... 289 characters folded ...]
</svg></button>
<div class="mb-4 flex items-center justify-center"><a href="https://www.flightradar24.com/premium" target="_blank" class="h-10 px-4 py-2 text-center text-base font-semibold text-white bg-green-500 rounded-md whitespace-nowrap hover:bg-green-400 block sm:hidden" data-testid="aside-main-menu__try-for-free-btn"><!--[-->Try free for 7 days<!--]--></a><a href="https://www.flightradar24.com/premium" target="_blank" class="h-10 px-4 py-2 block text-center text-base font-semibold text-white bg-green-500 rounded-md whitespace-nowrap hover:bg-green-400 xx:hidden sm:block"><!--[-->Upgrade now <!--[--> I Try free for 7 days<!--]--><!--]--></a>
</div>
<nav class="mb-4"><!--[-->
<div><a class="border-transparent font-normal text-gray-300 focus:text-gray-300 no-underline hover:text-yellow-500 hover:no-underline focus:no-underline focus:hover:text-yellow-500 justify-start mt-3 group ml-px flex items-ce [... 177 characters folded ...]><!--[-->
<h1 class="flex items-center text-white">Flight tracker map <!----><!----><!----><!----><!---->
</h1>
<svg xmlns="http://www.w3.org/2000/svg" width="32" height="14" class="ml-2">[... 423 characters folded ...]
</svg><!----><!--]--></a>
<div style="overflow-y:hidden;" class="slide-up-down__container" aria-hidden="true" tabindex="-1">
</div><!---->
</div>
<div><a class="border-transparent font-normal text-gray-300 focus:text-gray-300 no-underline hover:text-yellow-500 hover:no-underline focus:no-underline focus:hover:text-yellow-500 justify-between group ml-px flex items-cente [... 155 characters folded ...]><!--[--><span class="flex items-center text-white">Aviation data <!----><!----><!----><!----><!----></span><!----><span>
<svg xmlns="http://www.w3.org/2000/svg" fill="currentColor" viewBox="0 0 24 24" class="fill-current size-5 text-gray-400">[... 185 characters folded ...]
</svg></span><!--]--></a>
<div style="overflow-y:hidden;" class="slide-up-down__container" aria-hidden="true" tabindex="-1">
</div><!---->
</div>
<div><a class="border-transparent font-normal text-gray-300 focus:text-gray-300 no-underline hover:text-yellow-500 hover:no-underline focus:no-underline focus:hover:text-yellow-500 justify-between group ml-px flex items-cente [... 207 characters folded ...]><!--[--><span class="flex items-center text-white">Email alerts <!----><!---->
<div class="inline-flex items-center flex-row ml-1 size-5">
<svg xmlns="http://www.w3.org/2000/svg" fill="currentColor" viewBox="0 0 24 24" class="fill-current size-3 text-yellow-500">[... 240 characters folded ...]
</svg><!--[--><!--]--><!----><!--[--><!--]-->
</div><!----><!----></span><!----><!----><!--]--></a>
<div style="overflow-y:hidden;" class="slide-up-down__container" aria-hidden="true" tabindex="-1">
</div><!---->
</div>
<div><a class="border-transparent font-normal text-gray-300 focus:text-gray-300 no-underline hover:text-yellow-500 hover:no-underline focus:no-underline focus:hover:text-yellow-500 justify-between group ml-px flex items-cente [... 190 characters folded ...]><!--[--><span class="flex items-center text-white">Subscription plans <!---->
<svg xmlns="http://www.w3.org/2000/svg" fill="currentColor" viewBox="0 0 24 24" class="fill-current ml-1 w-5 h-5 text-green-500">[... 687 characters folded ...]
</svg><!----><!----><!----></span><!----><!----><!--]--></a>
<div style="overflow-y:hidden;" class="slide-up-down__container" aria-hidden="true" tabindex="-1">
</div><!---->
</div>
<div><a class="border-transparent font-normal text-gray-300 focus:text-gray-300 no-underline hover:text-yellow-500 hover:no-underline focus:no-underline focus:hover:text-yellow-500 justify-between group ml-px flex items-cente [... 154 characters folded ...]><!--[--><span class="flex items-center text-white">Add coverage <!----><!----><!----><!----><!----></span><!----><span>
<svg xmlns="http://www.w3.org/2000/svg" fill="currentColor" viewBox="0 0 24 24" class="fill-current size-5 text-gray-400">[... 185 characters folded ...]
</svg></span><!--]--></a>
<div style="overflow-y:hidden;" class="slide-up-down__container" aria-hidden="true" tabindex="-1">
</div><!---->
</div>
<div><a class="border-transparent font-normal text-gray-300 focus:text-gray-300 no-underline hover:text-yellow-500 hover:no-underline focus:no-underline focus:hover:text-yellow-500 justify-between group ml-px flex items-cente [... 161 characters folded ...]><!--[--><span class="flex items-center text-white">Flight data & API <!----><!----><!----><!----><!----></span><!----><span>
<svg xmlns="http://www.w3.org/2000/svg" fill="currentColor" viewBox="0 0 24 24" class="fill-current size-5 text-gray-400">[... 185 characters folded ...]
</svg></span><!--]--></a>
<div style="overflow-y:hidden;" class="slide-up-down__container" aria-hidden="true" tabindex="-1">
</div><!---->
</div>
<div><a class="border-transparent font-normal text-gray-300 focus:text-gray-300 no-underline hover:text-yellow-500 hover:no-underline focus:no-underline focus:hover:text-yellow-500 justify-between group ml-px flex items-cente [... 211 characters folded ...]><!--[--><span class="flex items-center text-white">Press & media center <!----><!----><!----><!----><!----></span><!----><!----><!--]--></a>
<div style="overflow-y:hidden;" class="slide-up-down__container" aria-hidden="true" tabindex="-1">
</div><!---->
</div>
<div><a class="border-transparent font-normal text-gray-300 focus:text-gray-300 no-underline hover:text-yellow-500 hover:no-underline focus:no-underline focus:hover:text-yellow-500 justify-between group ml-px flex items-cente [... 147 characters folded ...]><!--[--><span class="flex items-center text-white">About <!----><!----><!----><!----><!----></span><!----><span>
<svg xmlns="http://www.w3.org/2000/svg" fill="currentColor" viewBox="0 0 24 24" class="fill-current size-5 text-gray-400">[... 185 characters folded ...]
</svg></span><!--]--></a>
<div style="overflow-y:hidden;" class="slide-up-down__container" aria-hidden="true" tabindex="-1">
</div><!---->
</div>
<div><a class="border-transparent font-normal text-gray-300 focus:text-gray-300 no-underline hover:text-yellow-500 hover:no-underline focus:no-underline focus:hover:text-yellow-500 justify-between group ml-px flex items-cente [... 103 characters folded ...]><!--[--><span class="flex items-center text-white">Your Privacy Choices <!----><!----><!----><!----><img src="/build/assets/shield-checkmark_regular-2Bues21f.svg" class="ml-2 h-4 w-auto shrink-0 invert" alt></span><!----><!----><!--]--></a>
<div style="overflow-y:hidden;" class="slide-up-down__container" aria-hidden="true" tabindex="-1">
</div><hr class="m-4 border-gray-1200">
</div>
<div><a class="border-transparent font-normal text-gray-300 focus:text-gray-300 no-underline hover:text-yellow-500 hover:no-underline focus:no-underline focus:hover:text-yellow-500 justify-between group ml-px flex items-cente [... 176 characters folded ...]><!--[--><span class="flex items-center text-white">MyFR24 – flight logbook <!----><!----><!----><!----><!----></span><!----><!----><!--]--></a>
<div style="overflow-y:hidden;" class="slide-up-down__container" aria-hidden="true" tabindex="-1">
</div><!---->
</div>
<div><a class="border-transparent font-normal text-gray-300 focus:text-gray-300 no-underline hover:text-yellow-500 hover:no-underline focus:no-underline focus:hover:text-yellow-500 justify-between group ml-px flex items-cente [... 175 characters folded ...]><!--[--><span class="flex items-center text-white">JetPhotos – aviation photos <!----><!----><!----><!----><!----></span><!----><!----><!--]--></a>
<div style="overflow-y:hidden;" class="slide-up-down__container" aria-hidden="true" tabindex="-1">
</div><!---->
</div>
<div><a class="border-transparent font-normal text-gray-300 focus:text-gray-300 no-underline hover:text-yellow-500 hover:no-underline focus:no-underline focus:hover:text-yellow-500 justify-between group ml-px flex items-cente [... 177 characters folded ...]><!--[--><span class="flex items-center text-white">Forum <!----><!----><!----><!----><!----></span><!----><!----><!--]--></a>
<div style="overflow-y:hidden;" class="slide-up-down__container" aria-hidden="true" tabindex="-1">
</div><!---->
</div>
<div><a class="border-transparent font-normal text-gray-300 focus:text-gray-300 no-underline hover:text-yellow-500 hover:no-underline focus:no-underline focus:hover:text-yellow-500 justify-between group ml-px flex items-cente [... 170 characters folded ...]><!--[--><span class="flex items-center text-white">Skycards - aviation game <!----><!----><!----><!----><!----></span><!----><!----><!--]--></a>
<div style="overflow-y:hidden;" class="slide-up-down__container" aria-hidden="true" tabindex="-1">
</div><!---->
</div><!--]-->
</nav>
</div>
<div class="flex shrink-0 flex-col bg-gray-1500 pb-6 pt-4">
<div class="hidden w-full items-center justify-between px-4 sm:px-8 lg:flex"><a href="https://apps.apple.com/app/apple-store/id382233851?pt=6561867&mt=8&ct=fr24_mobile_menu_bottom" target="_blank" class="focus-visible:focus-ring inline-block h-10 w-30 shrink-0 rounded-md"><img class="size-full" src="/assets/svg/apps/apple-app-store.svg" alt="Download on the App Store" title="Download on the App Store"></a><a href="https://play.google.com/store/apps/details?id=com.flightradar24free&hl=en&referrer=utm_source=fr24_left_panel_social" target="_blank" class="focus-visible:focus-ring inline-block h-10 w-30 shrink-0 rounded-md"><img class="size-full" src="/assets/svg/apps/google-play-store.svg" alt="Get it on Google Play" title="Get it on Google Play"></a>
</div>
<div class="mb-2 grid grid-cols-2 gap-y-4 px-4 text-center text-sm font-normal text-gray-200 sm:px-2 lg:mb-0 lg:mt-4 lg:flex"><a class="flex flex-col items-center justify-center space-y-1 bg-gray-1500 no-underline hover:text-yellow-500 hover:no-underline focus:text-gray-300 focus:no-underline focus:hover:text-yellow-500" href="https://www.flightradar24.com/blog/newsletter"><!--[--><img src="/assets/svg/newsletter.svg?url" class="size-6"><span>Subscribe to newsletter</span><!--]--></a><a class="flex flex-col items-center justify-center space-y-1 bg-gray-1500 no-underline hover:text-yellow-500 hover:no-underline focus:text-gray-300 focus:no-underline focus:hover:text-yellow-500" href="https://www.flightradar24.com/blog"><!--[--><img src="/assets/svg/blog.svg?url" class="size-7"><span>Check out blog</span><!--]--></a><a class="flex flex-col items-center justify-center space-y-1 bg-gray-1500 no-underline hover:text-yellow-500 hover:no-underline focus:text-gray-300 focus:no-underline focus:hover:text-yellow-500" href="https://www.flightradar24.com/blog/avtalk-podcast"><!--[--><img src="/assets/svg/podcast.svg?url" class="h-7 w-8"><span>Listen to podcast</span><!--]--></a><a class="flex flex-col items-center justify-center space-y-1 bg-gray-1500 no-underline hover:text-yellow-500 hover:no-underline focus:text-gray-300 focus:no-underline focus:hover:text-yellow-500" href="https://www.flightradar24.com/blog/flightradar24-videos"><!--[--><img src="/assets/svg/watch-videos-icon.svg?url" class="size-7"><span>Watch videos</span><!--]--></a>
</div>
<div class="mt-4 flex items-center justify-between px-4 sm:px-8"><!--[--><a class="text-gray-800 no-underline hover:text-yellow-500 hover:no-underline focus:text-gray-800 focus:no-underline focus:hover:text-yellow-500" href="https://www.facebook.com/flightradar24" target="_blank">
<svg xmlns="http://www.w3.org/2000/svg" fill="currentColor" viewBox="0 0 24 24" class="fill-current size-5">[... 320 characters folded ...]
</svg></a><a class="text-gray-800 no-underline hover:text-yellow-500 hover:no-underline focus:text-gray-800 focus:no-underline focus:hover:text-yellow-500" href="https://www.instagram.com/flightradar24" target="_blank">
<svg xmlns="http://www.w3.org/2000/svg" fill="currentColor" viewBox="0 0 24 24" class="fill-current size-5">[... 965 characters folded ...]
</svg></a><a class="text-gray-800 no-underline hover:text-yellow-500 hover:no-underline focus:text-gray-800 focus:no-underline focus:hover:text-yellow-500" href="https://twitter.com/flightradar24" target="_blank">
<svg xmlns="http://www.w3.org/2000/svg" fill="currentColor" viewBox="0 0 24 24" class="fill-current size-5">[... 250 characters folded ...]
</svg></a><a class="text-gray-800 no-underline hover:text-yellow-500 hover:no-underline focus:text-gray-800 focus:no-underline focus:hover:text-yellow-500" href="https://www.linkedin.com/company/flightradar24-ab" target="_blank">
<svg xmlns="http://www.w3.org/2000/svg" fill="currentColor" viewBox="0 0 24 24" class="fill-current size-5">[... 374 characters folded ...]
</svg></a><a class="text-gray-800 no-underline hover:text-yellow-500 hover:no-underline focus:text-gray-800 focus:no-underline focus:hover:text-yellow-500" href="https://www.youtube.com/@Flightradar24DotCom" target="_blank">
<svg xmlns="http://www.w3.org/2000/svg" fill="currentColor" viewBox="0 0 24 24" class="fill-current size-5">[... 480 characters folded ...]
</svg></a><a class="text-gray-800 no-underline hover:text-yellow-500 hover:no-underline focus:text-gray-800 focus:no-underline focus:hover:text-yellow-500" href="https://bsky.app/profile/flightradar24.com" target="_blank">
<svg xmlns="http://www.w3.org/2000/svg" fill="currentColor" viewBox="0 0 24 24" class="fill-current size-5">[... 485 characters folded ...]
</svg></a><a class="text-gray-800 no-underline hover:text-yellow-500 hover:no-underline focus:text-gray-800 focus:no-underline focus:hover:text-yellow-500" href="https://www.tiktok.com/@therealflightradar24" target="_blank">
<svg xmlns="http://www.w3.org/2000/svg" fill="currentColor" viewBox="0 0 24 24" class="fill-current size-5">[... 267 characters folded ...]
</svg></a><!--]-->
</div>
</div>
</aside>
<div class="w-14 shrink-0">
</div><!---->
</div><!--]--><!--[-->
<div class="absolute inset-x-0 top-0 z-40" data-v-40f07d72>
Shown with 44 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 224 KB.
Reading view the text a plain-fetch client can extract
title: Flightradar24: Live Flight Tracker - Real-Time Flight Tracker Map | Flightradar24
Flight tracker map
Try free for 7 days Upgrade now I Try free for 7 days Flight tracker map Aviation data Email alerts Subscription plans Add coverage Flight data & API Press & media center About Your Privacy Choices MyFR24 – flight logbook JetPhotos – aviation photos Forum Skycards - aviation game Subscribe to newsletter Check out blog Listen to podcast Watch videos Log in
62 words in all.
| Check | Result | Detail |
|---|---|---|
| H1 in the initial HTML | Found one H1 | First H1: Flight tracker map |
| First 200 words in the initial HTML | Note 62 words | Only 62 words of visible text arrive in the initial HTML. That is a short page, not a shell. |
| llms.txt present and linked | Note present, not linked | 2078 bytes, 0 links. Structure grade D (3 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 | Missing none | No JSON-LD block on the home page. Ora's lab found it made no difference when the answer was already in the HTML; Google says it is not needed for AI features. |
| 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 flightradar24.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