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: 3 of 6 checks found.
Initial HTML what a plain fetch receives
<!DOCTYPE html>
<html lang="en" dir="ltr">
<head>
<meta charset="utf-8" />
[... 2 more head elements folded ...]
<title data-rh="true"></title>
[... 21 more head elements folded ...]
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=0, viewport-fit=cover" />
[... 2 more head elements folded ...]
<link rel="canonical" href="https://substack.com/" />
[... 9 more head elements folded ...]
</head>
<body class="pc-root">
<script>[... 441 characters folded ...]</script>
<div id="entry">
<div class="reader-nav-root reader2-font-base" style="--size-left-nav:0;--size-mobile-nav:0px;--size-top-bar:0px"><main class="reader-nav-page"><div class="page-nOiYa3" style="--home-bar:64px"><header class="topBar-kOhYxC"><div class="topBarInner-JgUNGN"><a href="/" class="brand-s1wad6" aria-label="Substack home"><svg aria-hidden="true" width="16" height="18" viewBox="0 0 16 18" fill="#ff6719" stroke-width="1.8" stroke="none" xmlns="http://www.w3.org/2000/svg">[... 123 characters folded ...]</svg><span>Substack</span></a><div class="actions-jp5b1R"><button class="pencraft pc-reset pencraft buttonBase-GK1x3M buttonText-X0uSmG buttonStyle-r7yGCK priority_tertiary-rlke8z size_md-gCDS3o" tabindex="0" type="button">Sign in</button><button class="pencraft pc-reset pencraft startCta-co7KAv buttonBase-GK1x3M buttonText-X0uSmG buttonStyle-r7yGCK priority_primary-RfbeYt size_md-gCDS3o" tabindex="0" type="button" data-href="https://substack.com/onboarding?flow=creator_signup">Start your Substack</button></div></div></header><div class="main-pIcIeS"><h1 style="position:absolute;border:0;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0, 0, 0, 0);white-space:nowrap;word-wrap:normal">Discover your next obsession</h1><div class="hero-AKBfjG"><div class="tileFrame-Hjn1Fe"><div class="poster-dz7yet"><span class="posterProof-CnpwSc"><span class="pile-bYmL8A posterFaces-55b3Ns" aria-hidden="true"><span class="face-viz515" data-state="leaving" style="--position:-1"><img src="https://substackcdn.com/image/fetch/$s_!flo4!,w_80,c_limit,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack.com%2Fimg%2Flogged_out_home%2Ffaces%2Fmagasin.jpg" alt="" width="40" height="40" loading="lazy" decoding="async"/></span><span class="face-viz515" style="--position:0"><img src="https://substackcdn.com/image/fetch/$s_!wDfQ!,w_80,c_limit,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack.com%2Fimg%2Flogged_out_home%2Ffaces%2Finagarten.jpg" alt="" width="40" height="40" loading="lazy" decoding="async"/></span><span class="face-viz515" style="--position:1"><img src="https://substackcdn.com/image/fetch/$s_!NSrH!,w_80,c_limit,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack.com%2Fimg%2Flogged_out_home%2Ffaces%2Flenny.jpg" alt="" width="40" height="40" loading="lazy" decoding="async"/></span><span class="face-viz515" style="--position:2"><img src="https://substackcdn.com/image/fetch/$s_!iiLA!,w_80,c_limit,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack.com%2Fimg%2Flogged_out_home%2Ffaces%2Fottolenghi.jpg" alt="" width="40" height="40" loading="lazy" decoding="async"/></span><span class="face-viz515" style="--position:3"><img src="https://substackcdn.com/image/fetch/$s_!t7Cf!,w_80,c_limit,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack.com%2Fimg%2Flogged_out_home%2Ffaces%2Fkareem.jpg" alt="" width="40" height="40" loading="lazy" decoding="async"/></span><span class="face-viz515" style="--position:4"><img src="https://substackcdn.com/image/fetch/$s_!omYb!,w_80,c_limit,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack.com%2Fimg%2Flogged_out_home%2Ffaces%2Fwhattocook.jpg" alt="" width="40" height="40" loading="lazy" decoding="async"/></span><span class="face-viz515" data-state="waiting" style="--position:5"><img src="https://substackcdn.com/image/fetch/$s_!V2Z7!,w_80,c_limit,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack.com%2Fimg%2Flogged_out_home%2Ffaces%2Ftinabrown.jpg" alt="" width="40" height="40" loading="lazy" decoding="async"/></span></span>Where independent creators publish</span><div class="stage-vDYBmd posterStage-xjg1hf" aria-hidden="true"><div class="orbit-CA9emo"><div class="slot-gocSgl" data-position="front"><div class="newsletter-Legga2"><div class="masthead-p2RP8F"><img src="https://substackcdn.com/image/fetch/$s_!k-bU!,w_48,h_48,c_fill,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fbucketeer-e05bbc84-baa3-437e-9518-adb32be77984.s3.amazonaws.com%2Fpublic%2Fimages%2Fe044d6fc- [... 104 characters folded ...]><span><strong>Story Club</strong><span>George Saunders</span></span></div><div class="hero-Q4QNnj"><img src="https://substackcdn.com/image/fetch/$s_!pVOI!,w_408,h_204,c_fill,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack-post-media.s3.amazonaws.com%2Fpublic%2Fimages%2F96eebe82-7274-4b4c-ab6f-8bc16d4d55a3_640x480.jpeg" alt="" width="204" height="102" loading="lazy" decoding="async"/></div><strong class="headline-onciEd">Some Thoughts on Non-Fiction</strong><span class="excerpt-OaiF2H">Hi Everyone, Back home after a wonderful visit to Washington and Lee University. Thanks to everyone there for a truly mind-opening series of discussions on writing and life.</span><span class="subscribe-CH3g39">Subscribe</span></div></div><div class="slot-gocSgl" data-position="right"><div class="podcast-J2SlLE"><div class="coverArt-dTNTGe"><img src="https://substackcdn.com/image/fetch/$s_!HozL!,w_104,h_104,c_fill,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack-post-media.s3.amazonaws.com%2Fpublic%2Fimages%2Fc08194ac-5a99-42fb-b27a-4a1d29723922_635x635.png" alt="" width="52" height="52" loading="lazy" decoding="async"/></div><strong class="episodeTitle-gxTcXs">Two Reasons to Meditate</strong><span class="episodeMeta-zWGRex">Making Sense · <!-- -->Sam Harris</span><span class="waveform-s59SmJ"><span style="--h:0.35;--i:0"></span><span style="--h:0.6;--i:1"></span><span style="--h:0.85;--i:2"></span><span style="--h:0.5;--i:3"></span><span style="--h:0.95;--i:4"></span><span style="--h:0.7;--i:5"></span><span style="--h:0.4;--i:6"></span><span style="--h:0.8;--i:7"></span><span style="--h:0.55;--i:8"></span><span style="--h:1;--i:9"></span><span style="--h:0.65;--i:10"></span><span style="--h:0.45;--i:11"></span><span style="--h:0.75;--i:12"></span><span style="--h:0.9;--i:13"></span><span style="--h:0.5;--i:14"></span><span style="--h:0.3;--i:15"></span><span style="--h:0.7;--i:16"></span><span style="--h:0.85;--i:17"></span><span style="--h:0.6;--i:18"></span><span style="--h:0.4;--i:19"></span><span style="--h:0.65;--i:20"></span><span style="--h:0.8;--i:21"></span><span style="--h:0.5;--i:22"></span><span style="--h:0.35;--i:23"></span></span><span class="scrubber-wUKWPV"><span>3:41</span><span class="scrubTrack-zcubgD"><span></span></span><span>12:41</span></span><span class="playButton-_vMhet"><svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="currentColor" stroke="currentColor" stroke-width="0" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-pause"><rect x="14" y="4" width="4" height="16" rx="1"></rect><rect x="6" y="4" width="4" height="16" rx="1"></rect></svg></span></div></div><div class="slot-gocSgl" data-position="left"><div class="video-gAFH5k"><div class="frame-baTAtT"><video src="/img/logged_out_home/parnas-perspective.mp4" poster="https://substackcdn.com/image/fetch/$s_!fSzd!,w_464,c_limit,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack.com%2Fimg%2Flogged_out_home%2Fpa [... 94 characters folded ...]></video><span class="duration-W_yzoh">2:52</span><span class="videoProgress-pti24a"><span></span></span></div><div class="channel-nt9O5C"><img src="https://substackcdn.com/image/fetch/$s_!mOAW!,w_48,h_48,c_fill,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack-post-media.s3.amazonaws.com%2Fpublic%2Fimages%2F02e468d5-e2de-46c1-870c-d6502a65bdb0_400x400.jpeg" alt="" width="24" height="24" loading="lazy" decoding="async"/><span><strong>Major Good News and Important Updates About this Channel!</strong><span>The Parnas Perspective</span></span></div></div></div></div></div><div class="posterBody-TBuu64"><a class="posterTitle-gcyjh4" href="https://substack.com/onboarding?flow=creator_signup" data-native="true"><span style="position:absolute;border:0;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0, 0, 0, 0);white-space:nowrap;word-wrap:normal">Start a newsletter, podcast, or video show worth paying for. 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style="--x2:1;--y2:1;--w2:1;--h2:4;--x4:1;--y4:1;--w4:1;--h4:4;--note-lines:3"><span class="body-Y1HGdh"><span class="byline-WTTt5r"><img src="https://substackcdn.com/image/fetch/$s_!nODE!,w_56,c_limit,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack-post-media.s3.amazonaws.com%2Fpublic%2Fimages%2F8125e393-28e7-48e0-88ce-3ac1ba821fb6_132 [... 98 characters folded ...]><span class="pubName-8xXP7r">The Conscious Lee</span></span><span class="noteText-tRjkG3">SHARE TO EVERYBODY IN MISSISSIPPI </span><span class="noteImage-cOmZon"><img src="https://substackcdn.com/image/fetch/$s_!Pvdf!,w_640,c_limit,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack-post-media.s3.amazonaws.com%2Fpublic%2Fimages%2Fd592e3f7-853c-40c9-8c09-097628e11e78_13 [... 1342 characters folded ...]></span><span class="meta-KTbkNP"><span class="stats-ke4orj"><span class="stat-sqwtKz"><svg xmlns="http://www.w3.org/2000/svg" width="13" height="13" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-heart" aria-hidden="true">[... 154 characters folded ...]</svg>285</span><span class="stat-sqwtKz"><svg xmlns="http://www.w3.org/2000/svg" width="13" height="13" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-repeat2 lucide-repeat-2" aria-hidden="true">[... 146 characters folded ...]</svg>120</span></span></span></span></a><a href="https://substack.com/note/c-381252120" class="tile-BIPNei" data-reveal="true" data-size="snapshot" data-kind="note" data-overlay="false" aria-label="American artist Jane Fisher’s (woman on underwater steps) b. 1 [... 84 characters folded ...]><span class="body-Y1HGdh"><span class="byline-WTTt5r"><img src="https://substackcdn.com/image/fetch/$s_!vPFG!,w_56,c_limit,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack-post-media.s3.amazonaws.com%2Fpublic%2Fimages%2F67dd1c50-886a-4406-ad89-e0221855526f_736 [... 96 characters folded ...]><span class="pubName-8xXP7r">Rose Florence</span></span><span class="noteText-tRjkG3">American artist Jane Fisher’s (woman on underwater steps) b. 1961</span><span class="noteImage-cOmZon"><img src="https://substackcdn.com/image/fetch/$s_!dpJU!,w_640,c_limit,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack-post-media.s3.amazonaws.com%2Fpublic%2Fimages%2F5da63381-67ae-4fd3-9269-a6cdd6b507e6_14 [... 1348 characters folded ...]></span><span class="meta-KTbkNP"><span class="stats-ke4orj"><span class="stat-sqwtKz"><svg xmlns="http://www.w3.org/2000/svg" width="13" height="13" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-heart" aria-hidden="true">[... 154 characters folded ...]</svg>1455</span><span class="stat-sqwtKz"><svg xmlns="http://www.w3.org/2000/svg" width="13" height="13" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-repeat2 lucide-repeat-2" aria-hidden="true">[... 146 characters folded ...]</svg>90</span></span></span></span></a><a href="https://substack.com/note/c-381434066" class="tile-BIPNei" data-reveal="true" data-size="snapshot" data-kind="note" data-overlay="false" aria-label="The step mom in a Daily Wire remake of The Parent Trap" style="--x2:1;--y2:5;--w2:1;--h2:4;--x4:3;--y4:1;--w4:1;--h4:4;--note-lines:3"><span class="body-Y1HGdh"><span class="byline-WTTt5r"><img src="https://substackcdn.com/image/fetch/$s_!oaAR!,w_56,c_limit,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack-post-media.s3.amazonaws.com%2Fpublic%2Fimages%2F2d73f3fa-0905-48f8-a437-e24cf28b652e_400 [... 95 characters folded ...]><span class="pubName-8xXP7r">Gianmarco Soresi</span></span><span class="noteText-tRjkG3">The step mom in a Daily Wire remake of The Parent Trap</span><span class="noteImage-cOmZon"><img src="https://substackcdn.com/image/fetch/$s_!QV2N!,w_640,c_limit,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack-post-media.s3.amazonaws.com%2Fpublic%2Fimages%2F6576d23e-a61a-4c60-a5c5-7b1642329852_13 [... 1342 characters folded ...]></span><span class="meta-KTbkNP"><span class="stats-ke4orj"><span class="stat-sqwtKz"><svg xmlns="http://www.w3.org/2000/svg" width="13" height="13" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-heart" aria-hidden="true">[... 154 characters folded ...]</svg>133</span><span class="stat-sqwtKz"><svg xmlns="http://www.w3.org/2000/svg" width="13" height="13" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-repeat2 lucide-repeat-2" aria-hidden="true">[... 146 characters folded ...]</svg>2</span></span></span></span></a><a href="https://heresyourbite.substack.com/p/the-side-that-always-disappears-first" class="tile-BIPNei" data-reveal="true" data-post-id="223402940" data-size="feature" data-kind="post" data-overlay="false" aria-label="C [... 93 characters folded ...]><span class="cover-rd9siw"><link rel="preload" as="image" href="https://substackcdn.com/image/fetch/$s_!V3YC!,w_640,h_320,c_fill,f_auto,q_auto:good,fl_progressive:steep,g_auto/https%3A%2F%2Fsubstack-post-media.s3.a
Shown with 46 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 103 KB.
Reading view the text a plain-fetch client can extract
title: none in the initial HTML
Discover your next obsession
Substack Sign in Start your Substack Discover your next obsession Where independent creators publish Story ClubGeorge Saunders Some Thoughts on Non-FictionHi Everyone, Back home after a wonderful visit to Washington and Lee University. Thanks to everyone there for a truly mind-opening series of discussions on writing and life.Subscribe Two Reasons to MeditateMaking Sense · Sam Harris3:4112:41 2:52 Major Good News and Important Updates About this Channel!The Parnas Perspective Start a newsletter, podcast, or video show worth paying for. Free to start.Start a newsletter worth paying for.Start a podcast worth paying for.Start a video show worth paying for. Start your Substack for free Substack All Culture Technology Business U.S. Politics Finance Food & Drink Sports Art & Illustration World Politics Health Politics News Fashion & Beauty Music Faith & Spirituality Climate & Environment Science Literature Fiction Health & Wellness Design Travel Parenting Philosophy Comics International Crypto History Humor Education Film & TV Home & Garden Games Sign in Start your Substack The Conscious LeeSHARE TO EVERYBODY IN MISSISSIPPI 285 120 Rose FlorenceAmerican artist Jane Fisher’s (woman on underwater steps) b. 1961 1455 90 Gianmarco SoresiThe step mom in a Daily Wire remake of The Parent Trap 133 2 bite clubCorn PuddingCorn
79 more words follow in the initial HTML.
| Check | Result | Detail |
|---|---|---|
| H1 in the initial HTML | Found one H1 | First H1: Discover your next obsession |
| First 200 words in the initial HTML | Found 200 of 200 words | The initial HTML carries 279 words of visible text; the first 200 are marked in the left pane. |
| llms.txt present and linked | Note present, not linked | 18944 bytes, 72 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 | 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 substack.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