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/ja-jp/sitemap.xml 200 1 hop 205 ms

Final response headers (20)

date	Sat, 09 May 2026 10:30:35 GMT
content-type	application/xml; charset=utf-8
cache-control	public, max-age=0, must-revalidate
etag	W/"22e0b22b99d23a2bd894c7146864fdb2"
strict-transport-security	max-age=31536000; includeSubDomains
permissions-policy	geolocation=(), camera=(), microphone=()
referrer-policy	strict-origin-when-cross-origin
x-content-type-options	nosniff
x-frame-options	SAMEORIGIN
x-gww-loc	JA-JP
x-pgs-loc	JA-JP
x-xss-protection	1; mode=block
vary	accept-encoding
set-cookie	__cf_bm=ZXHrTHSBeHz4dvpcv3tKrHuQutN1A_rfNw6JXpeYjXU-1778322635.0458817-1.0.1.1-sehny10JmiwmW8f9eV9nuaiQFo9ctkbeSHw3nUoefEpy23.TGe2oaL7WL.cNeBK.mvvh_UJzN3_Jb.ZDU7BS9DMGfg5r_xQr2tbvDOYkdKiq31vd6HQdln8ScXxkSYPsdKFC2Hv0uBdaijtCkBV4gA; HttpOnly; Secure; Path=/; Domain=www.cloudflare.com; Expires=Sat, 09 May 2026 11:00:35 GMT
report-to	{"group":"cf-nel","max_age":604800,"endpoints":[{"url":"https://a.nel.cloudflare.com/report/v4?s=zDKJ%2Fpl145Xmh9ieg4RCX6DCoAC%2Byg5VUYH6nA1QnWZuK2Y9Q8zNenpQm4tREENqQbWiTrCeyb3D9eMRuEZm1h7OsDUTsKePlegrMHjJbIkMWSl7t8e2GDrKUrq8gSfy68nmCg%3D%3D"}]}
nel	{"report_to":"cf-nel","success_fraction":0.0,"max_age":604800}
content-encoding	br
server	cloudflare
cf-ray	9f9007950da42d00-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%2Fja-jp%2Fsitemap.xml

curl -s '/api/v1/http/headers?q=https%3A%2F%2Fwww.cloudflare.com%2Fja-jp%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