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: DNS lookup (dig) DNS propagation Domain WHOIS SSL certificate inspector HTTP headers Security headers grader MX lookup SPF tester DMARC tester

https://files.single10.app 200 1 hop 1198 ms

Final response headers (16)

alt-svc	h3=":443"; ma=2592000
content-encoding	gzip
content-security-policy	default-src 'self'; script-src 'self' 'nonce-q6QF/DydaYQU7oNrb1YpdKHGZ+Yb1s8uyLkXMl1OMoU='; style-src 'self' 'unsafe-inline'; frame-src ; img-src data: blob:; font-src 'self' data:; media-src ; connect-src ; object-src 'none'; base-uri 'self';
content-type	text/html; charset=UTF-8
date	Sat, 09 May 2026 07:11:17 GMT
referrer-policy	no-referrer
server	Apache/2.4.65 (Debian)
set-cookie	oc58e51x8vg4=92793355072ed063dd191e0b618659df; path=/; HttpOnly; SameSite=Lax, oc_sessionPassphrase=7qf3x78MHk5Xx5OCvcf%2FEl7w6a43fRMWWM1t5TRezksyXPj52FNGkEp%2F2pa0WDrRBdX34xz%2BF2Y5lijJUpIioYGh9GjbE5LdlyYv1nujbKH9ezFuina%2FZ4RXroLCeTL2; path=/; HttpOnly; SameSite=Lax, oc58e51x8vg4=92793355072ed063dd191e0b618659df; path=/; HttpOnly; SameSite=Lax, nc_sameSiteCookielax=true; path=/; httponly;expires=Fri, 31-Dec-2100 23:59:59 GMT; SameSite=lax, nc_sameSiteCookiestrict=true; path=/; httponly;expires=Fri, 31-Dec-2100 23:59:59 GMT; SameSite=strict, oc58e51x8vg4=92793355072ed063dd191e0b618659df; path=/; HttpOnly; SameSite=Lax, oc58e51x8vg4=92793355072ed063dd191e0b618659df; path=/; HttpOnly; SameSite=Lax, oc58e51x8vg4=92793355072ed063dd191e0b618659df; path=/; HttpOnly; SameSite=Lax, oc58e51x8vg4=e80dddb989e92f8fe221005ce4ce36ff; path=/; HttpOnly; SameSite=Lax, oc58e51x8vg4=e80dddb989e92f8fe221005ce4ce36ff; path=/; HttpOnly; SameSite=Lax
vary	Accept-Encoding
via	1.1 Caddy
x-content-type-options	nosniff
x-frame-options	SAMEORIGIN
x-permitted-cross-domain-policies	none
x-powered-by	PHP/8.3.28
x-robots-tag	noindex, nofollow
content-length	1681

Tech stack

ApacheX-Powered-By: PHP/8.3.28HTTP/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=files.single10.app

curl -s '/api/v1/http/headers?q=files.single10.app'

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