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: 5 of 6 checks found.
Initial HTML what a plain fetch receives
<!DOCTYPE html>
<html lang="en-US">
<head>
[... 1 more head element folded ...]
<meta charset="utf-8">
<meta http-equiv="x-ua-compatible" content="ie=edge">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
[... 7 more head elements folded ...]
<title>Klaviyo: AI Email Marketing & SMS | B2C CRM
</title>
<meta name="description" content="Klaviyo unifies AI-powered email marketing and SMS to drive growth, retention, and measurable results. Build personalized, omnichannel experiences across WhatsApp, ecommerce, and more with K:AI Agents.">
<link rel="alternate" href="https://www.klaviyo.com" hreflang="en-US">
<link rel="alternate" href="https://www.klaviyo.com/uk/" hreflang="en-GB">
<link rel="alternate" href="https://www.klaviyo.com/de/" hreflang="de">
<link rel="alternate" href="https://www.klaviyo.com/au/" hreflang="en-AU">
<link rel="alternate" href="https://www.klaviyo.com/sg/" hreflang="en-SG">
<link rel="alternate" href="https://www.klaviyo.com/es/" hreflang="es-ES">
<link rel="alternate" href="https://www.klaviyo.com/fr/" hreflang="fr-FR">
<link rel="alternate" href="https://www.klaviyo.com/it/" hreflang="it-IT">
<link rel="alternate" href="https://www.klaviyo.com" hreflang="x-default">
[... 42 more head elements folded ...]
<meta id="meta-robots-tag" name="robots" content="index, follow">
<link id="link-rel-canonical" rel="canonical" href="https://www.klaviyo.com/">
[... 19 more head elements folded ...]
</head>
<body class="special">
<style>astro-island,astro-slot,astro-static-slot{display:contents}
</style>
<script>[... 130 characters folded ...]
</script>
<script>[... 4,380 characters folded ...]
</script><astro-island uid="Z223hxh" prefix="r61" component-url="/_cf-astro/index.CKn3wVDL.js" component-export="default" renderer-url="/_cf-astro/client.CoCcgmCG.js" props="{}" ssr client="load" before-hydration-url="/_cf-astro/ [... 134 characters folded ...]></astro-island><astro-island uid="Z16PlXh" prefix="r7" component-url="/_cf-astro/index.BvTcb49f.js" component-export="UniversalHeader" renderer-url="/_cf-astro/client.CoCcgmCG.js" props="{"announcementBars":[1,[[0,{"_cre [... 206830 characters folded ...]>
<header id="primary-navigation-header" class="_header_7p3pn_5"><a data-variant="ghost" aria-label="Skip to main content" class="_dark_1cufw_112 _skipButton_1jt0p_1 _button_1cufw_1 _ghost_1cufw_52" href="#site-content" role="link" tabindex="0" target="_self" id="skip-button">Skip to main content</a>
<div id="universal-navigation" class="_universalNav_m21g9_1 _invertOnHover_m21g9_44">
<div class="grid _container_m21g9_62 _containerPrimaryNav_m21g9_133"><a title="Go to the Klaviyo home page" href="/" class="_logoContainer_m21g9_76">
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 581 172" color="currentColor" style="height:3.6rem" class="_logo_m21g9_76">[... 4,019 characters folded ...]
</svg>
<svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 266 178" color="currentColor" style="height:3rem" class="_flag_m21g9_87"><path fill="currentColor" d="M266 178H0V0h266l-55.835 89z"></path>
</svg></a>
<nav class="_nav_m21g9_124">
<ul class="ds-v2 _list_uk1q8_1 _list_m21g9_224" data-theme="default">
<li class="_listItem_m21g9_238" data-hide-below="s1024"><button type="button" class="button button-nav-top-anchors _trigger_uk1q8_12" aria-controls="_r7R_j7_-b59b9bb85d8e" aria-expanded="false">Products
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 9 5" color="currentColor" aria-hidden="true" class="_chevron_uk1q8_16"><path fill="currentColor" d="M.88 0 4.5 3.101 8.12 0 9 .914 4.5 5 0 .914z"></path>
</svg></button>
<div class="ds-v2 _panel_uk1q8_24" data-theme="default" hidden="" id="_r7R_j7_-b59b9bb85d8e">
<div class="contained _panelContent_uk1q8_40">
<div class="_panel_11uim_1" data-testid="primary-nav-panel">
<div class="_calloutBar_p817r_1" data-testid="primary-nav-callout-bar">
<p class="text-heading-h3 _title_p817r_7">The Autonomous B2C CRM
</p>
<ul class="_list_p817r_11">
<li class="_item_p817r_21" data-variant="primary"><a class="button button-nav-callout-links-primary _calloutLink_8e8pv_1" href="/composer">Composer (AI Marketing Agent)
<svg xmlns="http://www.w3.org/2000/svg" data-name="globe" viewBox="0 0 32 32" color="currentColor" aria-hidden="true"><path fill="currentColor" d="m32 27.5-4.12 4.21-.05-24.56L3.03 32l-3-3.02L24.82 4.14.43 4.03 4.6 0H32z"></path>
</svg></a>
</li>
<li class="_item_p817r_21" data-variant="primary"><a class="button button-nav-callout-links-primary _calloutLink_8e8pv_1" href="/solutions/ai/customer-agent">Customer Agent
<svg xmlns="http://www.w3.org/2000/svg" data-name="globe" viewBox="0 0 32 32" color="currentColor" aria-hidden="true"><path fill="currentColor" d="m32 27.5-4.12 4.21-.05-24.56L3.03 32l-3-3.02L24.82 4.14.43 4.03 4.6 0H32z"></path>
</svg></a>
</li>
<li class="_item_p817r_21" data-variant="secondary"><a class="button button-nav-callout-links-secondary _calloutLink_8e8pv_1" href="/platform">Explore the full platform
<svg xmlns="http://www.w3.org/2000/svg" data-name="globe" viewBox="0 0 32 32" color="currentColor" aria-hidden="true"><path fill="currentColor" d="m32 27.5-4.12 4.21-.05-24.56L3.03 32l-3-3.02L24.82 4.14.43 4.03 4.6 0H32z"></path>
</svg></a>
</li>
</ul>
</div><hr class="divider divider-subtle"/>
<div class="_row_1quki_1" data-testid="primary-nav-link-columns" style="--primary-nav-tracks:3">
<div class="_cell_1quki_8" data-divider="true" style="--primary-nav-span:1">
<div class="_column_do2yn_1" data-testid="primary-nav-column">
<div class="_header_do2yn_11">
<h3 class="_title_do2yn_38 _linkedTitle_do2yn_46"><a class="button button-nav-column-title-links" href="/solutions/marketing-automation"><span>Marketing</span>
<svg xmlns="http://www.w3.org/2000/svg" data-name="globe" viewBox="0 0 32 32" color="currentColor" aria-hidden="true"><path fill="currentColor" d="m32 27.5-4.12 4.21-.05-24.56L3.03 32l-3-3.02L24.82 4.14.43 4.03 4.6 0H32z"></path>
</svg></a>
</h3>
</div>
<div class="_group_3qb0o_1" data-testid="primary-nav-link-group">
<ul class="_list_3qb0o_7">
<li><a class="button button-nav-links" href="/composer">Composer (Marketing Agent)</a>
</li>
<li><a class="button button-nav-links" href="/products/email-marketing">Email</a>
</li>
<li><a class="button button-nav-links" href="/products/sms-marketing">SMS</a>
</li>
<li><a class="button button-nav-links" href="/products/sms-marketing/rcs">RCS for Business</a>
</li>
<li><a class="button button-nav-links" href="/products/whatsapp">WhatsApp</a>
</li>
<li><a class="button button-nav-links" href="/products/social">Social</a>
</li>
<li><a class="button button-nav-links" href="/products/mobile-app-marketing">Mobile app</a>
</li>
<li><a class="button button-nav-links" href="/products/customer-experience-hub">Customer Hub</a>
</li>
</ul>
</div>
<div class="_relatedLinks_1fdfs_1" data-testid="primary-nav-related-links">
<p id="_r7R_59l2mj7_-eyebrow" class="text-eyebrow-md _eyebrow_19j2r_3">Featured
</p>
<ul class="_list_1fdfs_7" aria-labelledby="_r7R_59l2mj7_-eyebrow">
<li><a class="button button-related-link-outline" href="/products/review-management">Reviews</a>
</li>
<li><a class="button button-related-link-outline" href="/features/campaigns">Campaigns</a>
</li>
<li><a class="button button-related-link-outline" href="/features/flows">Flows</a>
</li>
<li><a class="button button-related-link-outline" href="/features/segmentation">Segmentation</a>
</li>
<li><a class="button button-related-link-outline" href="https://www.klaviyo.com/features/web-forms">Forms</a>
</li>
</ul>
</div>
</div>
</div>
<div class="_cell_1quki_8" data-divider="true" style="--primary-nav-span:1">
<div class="_column_do2yn_1" data-testid="primary-nav-column">
<div class="_header_do2yn_11">
<h3 class="_title_do2yn_38 _linkedTitle_do2yn_46"><a class="button button-nav-column-title-links" href="/solutions/customer-service"><span>Service</span>
<svg xmlns="http://www.w3.org/2000/svg" data-name="globe" viewBox="0 0 32 32" color="currentColor" aria-hidden="true"><path fill="currentColor" d="m32 27.5-4.12 4.21-.05-24.56L3.03 32l-3-3.02L24.82 4.14.43 4.03 4.6 0H32z"></path>
</svg></a>
</h3>
</div>
<div class="_group_3qb0o_1" data-testid="primary-nav-link-group">
<ul class="_list_3qb0o_7">
<li><a class="button button-nav-links" href="/solutions/ai/customer-agent">Customer Agent</a>
</li>
<li><a class="button button-nav-links" href="/products/helpdesk">Helpdesk</a>
</li>
</ul>
</div>
<div class="_relatedLinks_1fdfs_1" data-testid="primary-nav-related-links">
<p id="_r7R_5al2mj7_-eyebrow" class="text-eyebrow-md _eyebrow_19j2r_3">FEATURED
</p>
<ul class="_list_1fdfs_7" aria-labelledby="_r7R_5al2mj7_-eyebrow">
<li><a class="button button-related-link-outline" href="https://help.klaviyo.com/hc/en-us/articles/56974158507803" target="_blank" rel="noopener noreferrer">Agent builder</a>
</li>
<li><a class="button button-related-link-outline" href="https://help.klaviyo.com/hc/en-us/articles/360045726811" target="_blank" rel="noopener noreferrer">APIs & connectors</a>
</li>
<li><a class="button button-related-link-outline" href="https://help.klaviyo.com/hc/en-us/articles/37659457059739" target="_blank" rel="noopener noreferrer">Auto-training</a>
</li>
<li><a class="button button-related-link-outline" href="https://help.klaviyo.com/hc/en-us/articles/57318314698907" target="_blank" rel="noopener noreferrer">Guardrails</a>
</li>
Shown with 67 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 673 KB.
Reading view the text a plain-fetch client can extract
title: Klaviyo: AI Email Marketing & SMS | B2C CRM
Your AI marketing agent, always a step ahead
Skip to main content Products The Autonomous B2C CRM Composer (AI Marketing Agent) Customer Agent Explore the full platform Marketing Composer (Marketing Agent) Email SMS RCS for Business WhatsApp Social Mobile app Customer Hub Featured Reviews Campaigns Flows Segmentation Forms Service Customer Agent Helpdesk FEATURED Agent builder APIs & connectors Auto-training Guardrails Data & personalization Klaviyo Data Platform Advanced Data Platform Personalization FEATURED Unified profile management Multi-account management Predictive insights Organizations Apps & Integrations Explore apps Integrate with 400+ apps to seamlessly connect all of your data to Klaviyo. View top apps and integrations Popular integrations Integration benefits Our apps make it simple to integrate your entire tech stack. Browse by category Advertising Shipping Point of sale Loyalty Subscription Developers Create apps and integrations to grow your business using Klaviyo's APIs. Getting started Developer guides API docs Developer docs Build an integration Featured Featured integrationMuseAsk Muse about your campaigns, flows, and revenue, then have it draft and schedule your next send with your approval.See the app What’s New Highlights View all updates Composer knows your business and does the workComposer combines your business context, Klaviyo’s marketing expertise, and your connected tools to plan your calendar, build your campaigns, audit your
2027 more words follow in the initial HTML.
| Check | Result | Detail |
|---|---|---|
| H1 in the initial HTML | Found one H1 | First H1: Your AI marketing agent, always a step ahead |
| First 200 words in the initial HTML | Found 200 of 200 words | The initial HTML carries 2227 words of visible text; the first 200 are marked in the left pane. |
| llms.txt present and linked | Found present and linked | 21331 bytes, 101 links. Structure grade A (6 of 6). The home page links it, which is how agents reached it in Ora's lab. |
| Markdown on request | Missing 200 text/html | Accept: text/markdown returned 200 with text/html. 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 Answer, ContactPoint, FAQPage, ImageObject and 8 more | 12 schema.org types in JSON-LD blocks on the home page: Answer, ContactPoint, FAQPage, ImageObject, ItemList, Organization, Person, PostalAddress, Question, SearchAction, 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 klaviyo.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