HTTP headers

HTTP /api/v1/http/headers

Capture every response header, follow redirects, time each hop.

Try: https://host.com https://checkhost.com https://hostinfo.com https://crypt.tools

Related: HTTP headers Security headers grader Redirect chain tracer SSL certificate inspector robots.txt parser sitemap.xml inspector

https://www.cloudflare.com/en-in/sitemap.xml 403 1 hop 38 ms

Final response headers (23)

date	Sat, 09 May 2026 10:31:18 GMT
content-type	text/html; charset=UTF-8
accept-ch	Sec-CH-UA-Bitness, Sec-CH-UA-Arch, Sec-CH-UA-Full-Version, Sec-CH-UA-Mobile, Sec-CH-UA-Model, Sec-CH-UA-Platform-Version, Sec-CH-UA-Full-Version-List, Sec-CH-UA-Platform, Sec-CH-UA, UA-Bitness, UA-Arch, UA-Full-Version, UA-Mobile, UA-Model, UA-Platform-Version, UA-Platform, UA
cf-mitigated	challenge
content-security-policy	default-src 'none'; script-src 'nonce-ukHytPfnjrK2ilxOsRmrAB' 'unsafe-eval' https://challenges.cloudflare.com; script-src-attr 'none'; style-src 'unsafe-inline'; img-src 'self' https://challenges.cloudflare.com; connect-src 'self' https://challenges.cloudflare.com; frame-src 'self' https://challenges.cloudflare.com blob:; child-src 'self' https://challenges.cloudflare.com blob:; worker-src blob:; form-action http: https:; base-uri 'self'
server	cloudflare
critical-ch	Sec-CH-UA-Bitness, Sec-CH-UA-Arch, Sec-CH-UA-Full-Version, Sec-CH-UA-Mobile, Sec-CH-UA-Model, Sec-CH-UA-Platform-Version, Sec-CH-UA-Full-Version-List, Sec-CH-UA-Platform, Sec-CH-UA, UA-Bitness, UA-Arch, UA-Full-Version, UA-Mobile, UA-Model, UA-Platform-Version, UA-Platform, UA
cross-origin-embedder-policy	require-corp
cross-origin-opener-policy	same-origin
cross-origin-resource-policy	same-origin
origin-agent-cluster	?1
permissions-policy	accelerometer=(),browsing-topics=(),camera=(),clipboard-read=(),clipboard-write=(),geolocation=(),gyroscope=(),hid=(),interest-cohort=(),magnetometer=(),microphone=(),payment=(),publickey-credentials-get=(),screen-wake-lock=(),serial=(),sync-xhr=(),usb=(),xr-spatial-tracking=(self)
referrer-policy	same-origin
server-timing	chlray;desc="9f9008a4bc9bfffd"
x-content-type-options	nosniff
x-frame-options	SAMEORIGIN
vary	accept-encoding
set-cookie	__cf_bm=1QHkC1UlDC7faT9K9KYC.ntnoNIG0aHLIWxHo1thCJU-1778322678.5201557-1.0.1.1-rBMkNq4Y3H1dVmPy3teokyR5L21W04u8CQrtuG4sZyF3kf8QSNbs2HqHVAlnoe7r8dD.NkhQ4LEqWIqrbApx.oJ7aQTV_itEtlx59M.yRjJwItdPKchVP8Y.sOmvDLqVHv0KkswpKVTUZT87rK_8kA; HttpOnly; Secure; Path=/; Domain=www.cloudflare.com; Expires=Sat, 09 May 2026 11:01:18 GMT
report-to	{"group":"cf-nel","max_age":604800,"endpoints":[{"url":"https://a.nel.cloudflare.com/report/v4?s=j6K0tjK4ym7yxJ2dTSHBlymHQf%2BVEHPPTsOGSTAiHlltWaHsYsFiWqQ8%2F1cImZmfHAfaI9rF2xo2OMEw73HtkS5ADoc3s8zixfNB3FIANvtU8SZx0o5vHGlv7vTQC0dhY0ykSQ%3D%3D"}]}
nel	{"report_to":"cf-nel","success_fraction":0.0,"max_age":604800}
content-encoding	br
cf-ray	9f9008a4bc9bfffd-AMS
alt-svc	h3=":443"; ma=86400

Tech stack

CloudflareHTTP/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%2Fwww.cloudflare.com%2Fen-in%2Fsitemap.xml

curl -s '/api/v1/http/headers?q=https%3A%2F%2Fwww.cloudflare.com%2Fen-in%2Fsitemap.xml'

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.

See pricing Tour monitors

✓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