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://crashlytics.com/ answered 200 with text/html, 504 KB, 1 redirect, read 8 November 2026, 13:53 UTC. Final URL: https://firebase.google.com/products/crashlytics/.

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

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

Initial HTML what a plain fetch receives










<!doctype html>
<html 
      lang="en"
      dir="ltr">
  <head>
[... 5 more head elements folded ...]
<meta charset="utf-8">
<meta content="IE=Edge" http-equiv="X-UA-Compatible">
<meta name="viewport" content="width=device-width, initial-scale=1">
[... 11 more head elements folded ...]
<link rel="canonical" href="https://firebase.google.com/products/crashlytics">
[... 1 more head element folded ...]
<link rel="alternate" hreflang="en"
          href="https://firebase.google.com/products/crashlytics" />
<link rel="alternate" hreflang="x-default" href="https://firebase.google.com/products/crashlytics" />
<link rel="alternate" hreflang="zh-Hans"
          href="https://firebase.google.com/products/crashlytics?hl=zh-cn" />
<link rel="alternate" hreflang="id"
          href="https://firebase.google.com/products/crashlytics?hl=id" />
<link rel="alternate" hreflang="ja"
          href="https://firebase.google.com/products/crashlytics?hl=ja" />
<link rel="alternate" hreflang="ko"
          href="https://firebase.google.com/products/crashlytics?hl=ko" />
<link rel="alternate" hreflang="pt-BR"
          href="https://firebase.google.com/products/crashlytics?hl=pt-br" />
<link rel="alternate" hreflang="es-419"
          href="https://firebase.google.com/products/crashlytics?hl=es-419" />
<title>Firebase Crashlytics | Track, prioritize, and fix app crashes faster</title>
[... 1 more head element folded ...]
<meta name="description" content="Explore how Firebase Crashlytics provides realtime app crash &amp;amp; stability reporting for iOS, Android, Flutter, and Unity apps so you can fix crashes faster.">
[... 4 more head elements folded ...]
<meta content="IE=edge" http-equiv="X-UA-Compatible"/>
<meta content="width=device-width, initial-scale=1" name="viewport"/>
[... 17 more head elements folded ...]
</head>
  <body class="firebase-page-product firebase__bg--white firesite-lang--en firebase-page-product firebase__bg--white color-scheme--light"
        template="page"
        theme="firebase-icy-theme"
        type="article"
   [... 216 characters folded ...]>
  
    <devsite-progress type="indeterminate" id="app-progress"></devsite-progress>
  
  
    <a href="#main-content" class="skip-link button">
      
      Skip to main content
    </a>
    <section class="devsite-wrapper">
      <devsite-cookie-notification-bar></devsite-cookie-notification-bar>
        <devsite-header role="banner" keep-tabs-visible>
  
    





















<div class="devsite-header--inner" data-nosnippet>
  <div class="devsite-top-logo-row-wrapper-wrapper">
    <div class="devsite-top-logo-row-wrapper">
      <div class="devsite-top-logo-row">
        <button type="button" id="devsite-hamburger-menu"
          class="devsite-header-icon-button button-flat material-icons gc-analytics-event"
          data-category="Site-Wide Custom Events"
          data-label="Navigation menu button"
          visually-hidden
          aria-label="Open menu">
        </button>
        
<div class="devsite-product-name-wrapper">

  <a href="/" class="devsite-site-logo-link gc-analytics-event"
   data-category="Site-Wide Custom Events" data-label="Site logo" track-type="globalNav"
   track-name="firebase" track-metadata-position="nav"
   track-metadata-eventDetail="nav">
  
  <picture>
    
    <source srcset="https://www.gstatic.com/devrel-devsite/prod/v0bdbebc1f01a38de21004f32be4e375582bd633675ce8e19f11ee677174d47b4/firebase/images/lockup.svg"
            media="(prefers-color-scheme: dark)"
            class="devsite-dark-theme">
    
    <img src="https://www.gstatic.com/devrel-devsite/prod/v0bdbebc1f01a38de21004f32be4e375582bd633675ce8e19f11ee677174d47b4/firebase/images/lockup.svg" class="devsite-site-logo" alt="Firebase">
  </picture>
  
</a>



</div>
        <div class="devsite-top-logo-row-middle">
          <div class="devsite-header-upper-tabs">
            
              
              
  <devsite-tabs class="upper-tabs">

    <nav class="devsite-tabs-wrapper" aria-label="Upper tabs">
      
        
          <tab class="devsite-dropdown
    
    
    
    ">
  
    <a href="https://firebase.google.com/products-build"
    class="devsite-tabs-content gc-analytics-event "
      track-metadata-eventdetail="https://firebase.google.com/products-build"
    
       track-type="nav"
        [... 261 characters folded ...]>
    Build

Shown with 113 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 504 KB.

Reading view the text a plain-fetch client can extract

title: Firebase Crashlytics | Track, prioritize, and fix app crashes faster

Track, prioritize, and fix app crashes faster

Skip to main content Build Build Get to market quickly and securely with products that can scale globally Go to Build Build Products App Check App Hosting Authentication Cloud Functions Cloud Storage SQL Connect Extensions Firestore Hosting Phone Number Verification Realtime Database Firebase AI Logic Generative AI Run Run Run your app with confidence and deliver the best experience for your users Go to Run Run Products A/B Testing App Distribution Cloud Messaging Crashlytics Google Analytics In-App Messaging Performance Monitoring Remote Config Test Lab Solutions Pricing Docs Overview Fundamentals AI Build Run Reference Samples Community Learn Stories Support / English Español – América Latina Indonesia Português – Brasil 中文 – 简体日本語 한국어 Blog Go to console Sign in Build More Run More Solutions Pricing Docs More Community More Support Blog Go to console Build Go to Build Build Products App Check App Hosting Authentication Cloud Functions Cloud Storage SQL Connect Extensions Firestore Hosting Phone Number Verification Realtime Database Firebase AI Logic Generative AI Run Go to Run Run Products A/B Testing App Distribution Cloud Messaging Crashlytics Google Analytics In-App Messaging Performance Monitoring Remote Config Test Lab Overview Fundamentals AI Build Run Reference Samples Learn Stories Firebase Send feedback Stay

676 more words follow in the initial HTML.

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

H1Found
200 wordsFound
llms.txtNote
MarkdownFound
Missing pathMissing
JSON-LDFound
OpenAPINote

What a plain fetch found on crashlytics.com
Check	Result	Detail
H1 in the initial HTML	Found one H1	First H1: Track, prioritize, and fix app crashes faster
First 200 words in the initial HTML	Found 200 of 200 words	The initial HTML carries 876 words of visible text; the first 200 are marked in the left pane.
llms.txt present and linked	Note present, not linked	6809 bytes, 41 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	Found text/markdown	Accept: text/markdown returned 200 with text/markdown; charset=utf-8. Vary: Accept is set.
Status of a made-up path	Missing 200 (soft 404)	/agent-ready-html-missing-path-check returned 200. A missing page that answers 200 looks like a live page to an agent.
JSON-LD types	Found Article	1 schema.org type in JSON-LD blocks on the home page: Article.
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 crashlytics.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