HTTP headers
HTTP /api/v1/http/headersCapture every response header, follow redirects, time each hop.
https://www.cloudflare.com/
200
2 hops
184 ms
Redirect chain
-
301
https://cloudflare.com26 ms -
200
https://www.cloudflare.com/57 ms
Final response headers (26)
| date | Tue, 15 Sep 2026 20:52:02 GMT |
| content-type | text/html; charset=utf-8 |
| link | <https://www.cloudflare.com/.well-known/agents.json>; rel="api-catalog", <https://www.cloudflare.com/.well-known/webmcp.json>; rel="service-desc", <https://www.cloudflare.com/openapi.json>; rel="service-desc", <https://www.cloudflare.com/llms.txt>; rel="service-doc", <https://www.cloudflare.com/sitemap.xml>; rel="sitemap", </fonts/Kunst%20Grotesk%20Regular.woff2>; rel=preload; as=font; type="font/woff2"; crossorigin, </fonts/Kunst%20Grotesk%20Medium.woff2>; rel=preload; as=font; type="font/woff2"; crossorigin, <https://ot.www.cloudflare.com>; rel=preconnect; crossorigin, <https://imagedelivery.net>; rel=preconnect; crossorigin, </static/hero-poster.avif>; rel=preload; as=image; type="image/avif"; fetchpriority=high |
| cf-ray | a3ba834be83c5c3b-AMS |
| cf-cache-status | HIT |
| age | 4 |
| cache-control | max-age=10 |
| last-modified | Tue, 15 Sep 2026 20:51:57 GMT |
| server | cloudflare |
| strict-transport-security | max-age=31536000; includeSubDomains |
| content-security-policy | default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval' https://static.cloudflareinsights.com https://static-staging.cloudflareinsights.com https://challenges.cloudflare.com https://*.onetrust.com https://cdn.cookielaw.org https://ot.www.cloudflare.com https://www.googletagmanager.com https://tagmanager.google.com https://www.googleadservices.com https://googleads.g.doubleclick.net https://adservice.google.com https://cdn.bizible.com https://js.adsrvr.org https://*.marketo.net https://platform.twitter.com https://static.ads-twitter.com https://scripts.demandbase.com https://tag.demandbase.com https://*.6sc.co https://*.qualified.com https://snap.licdn.com https://bat.bing.com; style-src 'self' 'unsafe-inline'; img-src 'self' data: https:; font-src 'self' data:; connect-src 'self' https://*.googletagmanager.com https://*.google-analytics.com https://*.google.com https://*.doubleclick.net https://www.googleadservices.com https://translate.googleapis.com https://cdn.bizible.com https://js.adsrvr.org https://*.marketo.net https://ads-twitter.com https://analytics.twitter.com https://*.twimg.com https://api.demandbase.com https://scripts.demandbase.com https://tag.demandbase.com https://tag-logger.demandbase.com https://api.company-target.com https://*.6sc.co https://epsilon.6sense.com https://*.qualified.com https://*.ads.linkedin.com https://www.linkedin.com https://bat.bing.com https: wss://*.qualified.com wss://*.registrar.cloudflare.com; frame-src https://*.adsrvr.org https://*.cloudflare.com https://*.videodelivery.net https://*.cloudflarestream.com https://www.googletagmanager.com https://*.qualified.com https://td.doubleclick.net https://bid.g.doubleclick.net https://9309168.fls.doubleclick.net https://9973066.fls.doubleclick.net https://s.company-target.com; object-src 'none'; base-uri 'self'; form-action 'self'; frame-ancestors 'none'; worker-src 'self' blob:; child-src 'self' blob:; upgrade-insecure-requests |
| cross-origin-opener-policy | unsafe-none |
| cross-origin-resource-policy | cross-origin |
| permissions-policy | geolocation=(), camera=(), microphone=() |
| referrer-policy | strict-origin-when-cross-origin |
| x-content-type-options | nosniff |
| x-frame-options | SAMEORIGIN |
| x-served-by | marketing-site |
| x-xss-protection | 1; mode=block |
| x-rm | GW |
| vary | accept-encoding |
| set-cookie | __cf_bm=vXc_sgcuVn5ryBEdvM_WU3UoXrDofCvhCg_D5J5FxYs-1789505522.5448382-1.0.1.1-Ht2djbQz9atmDkKVr3zw4wkqdIAGgCI3b2KFPEySpErayUxd1aXNL0oAY87OhUKqVpx6ae0KOHGHDf1vjbeSCsP5YU2x0r8TzQaWV7GaEao.kaKsFn9cBMaFGeX3d6wArH1OddaWumOaygImij0huw; HttpOnly; SameSite=None; Secure; Path=/; Domain=www.cloudflare.com; Expires=Tue, 15 Sep 2026 21:22:02 GMT |
| report-to | {"group":"cf-nel","max_age":604800,"endpoints":[{"url":"https://a.nel.cloudflare.com/report/v4?s=E3BLW0tG0CCN022Lfj4SKde%2BjN%2F6P%2FcpoNd96iTb5pTUxIjdXzPgflGquwdf0s6h%2F%2BYM3j%2Fsx%2FaFEeMrzkC4hr1tWf2cnjEmElLMi%2BDESwftxNPT27kR98YwTY0Kv0nxv17kPA%3D%3D"}]} |
| nel | {"report_to":"cf-nel","success_fraction":0.0,"max_age":604800} |
| content-encoding | br |
| alt-svc | h3=":443"; ma=86400 |
Tech stack
Cloudflaregenerator: Astro v6.3.7Google Tag ManagerHTTP/3 (QUIC)
How to use HTTP headers
-
1
Paste your input
Enter the value at the top — domain, IP, URL, email, ASN, hash, whatever fits this tool. The smart input auto-detects type.
-
2
Click "Inspect"
host.tools issues real probes (DNS, HTTP, TCP, TLS, WHOIS where applicable) and renders the result in milliseconds.
-
3
Open the API tab
Every web tool has a sibling /api/v1/http/headers JSON endpoint with the same payload. One copy-as-curl click and you're scripting it.
Why this matters
Headers are how the modern web declares its security posture. Auditing them is the highest-ROI thing you can do this week.
API equivalent
/api/v1/http/headers?q=https%3A%2F%2Fcloudflare.com
curl -s '/api/v1/http/headers?q=https%3A%2F%2Fcloudflare.com'
Embed this tool
<iframe src="/http/headers?q={INPUT}&embed=1"
width="100%" height="600" frameborder="0"></iframe>
Drop into any HTML page. The embed=1 flag hides nav and footer.
FAQ · HTTP headers
Common questions
Is HTTP headers free?
Yes — every tool is free on the web with a 200/hour rate limit per IP. The matching API endpoint /api/v1/http/headers is free up to 100 requests/hour, no key required.
Where does the data come from?
Real-time probes against authoritative sources (DNS root, RIRs, registries, the target server itself), plus partner data feeds from hostinfo.com (GeoIP/ASN) and hostcheck.com (reputation).
How fresh are the results?
Live by default. Cached for 5 minutes to make repeat queries instant; pass
?nocache=1 for a forced refresh.Can I run this from the command line?
Yes — every tool ships with a copy-as-curl. There's also an official CLI:
host.tools http headers YOUR_INPUT.Can I monitor results over time?
Pro tier lets you schedule any tool to run every 1/5/15/60 min and alert on diff. See monitors.
host.tools Pro
Run HTTP headers on a schedule. Get pinged when it changes.
Pro gets you bulk lookups, monitors, webhook alerts, history, exports and 10,000 API calls/day. $19/mo.
- ✓Schedule any tool — every 1, 5, 15, 60 min
- ✓Diff against last run, alert on change
- ✓Webhook + email + Slack + PagerDuty + OpsGenie
- ✓Bulk CSV upload, 1,000 inputs per job
- ✓Export results as CSV / NDJSON / Excel
- ✓90-day history, comparison view