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://link.jnkus.com 200 1 hop 160 ms

Final response headers (16)

access-control-allow-methods	*
access-control-allow-origin	http://link.jnkus.com, https://link.jnkus.com
access-control-expose-headers	*
access-control-max-age	600
cache-control	no-cache
content-security-policy	default-src 'self'; style-src 'self' https://fonts.googleapis.com 'sha256-qu/DA/rYdnX+6KBfIuR3TOhptBOBZW5dbmK89Ckd3gM=' 'sha256-zqiMqGYP1YZ5gW2psQKxjVB3CQGC7gzqZUrTnc1LAxQ='; font-src 'self' https://fonts.gstatic.com; frame-ancestors 'self'; form-action 'self'; script-src 'sha256-qu/DA/rYdnX+6KBfIuR3TOhptBOBZW5dbmK89Ckd3gM='; img-src 'self' https://www.smtp2go.com;
content-type	text/html; charset=utf-8
date	Wed, 10 Jun 2026 01:19:57 GMT
permissions-policy	accelerometer=(), ambient-light-sensor=(), autoplay=(), battery=(), camera=(), cross-origin-isolated=(), display-capture=(), document-domain=(), encrypted-media=(), execution-while-not-rendered=(), execution-while-out-of-viewport=(), fullscreen=(), geolocation=(), gyroscope=(), keyboard-map=(), magnetometer=(), microphone=(), midi=(), navigation-override=(), payment=(), picture-in-picture=(), publickey-credentials-get=(), screen-wake-lock=(), sync-xhr=(), usb=(), web-share=(), xr-spatial-tracking=()
referrer-policy	no-referrer
strict-transport-security	max-age=31536000; includeSubDomains
x-content-type-options	nosniff
x-frame-options	deny
x-permitted-cross-domain-policies	none
connection	close
transfer-encoding	chunked

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%2Flink.jnkus.com

curl -s '/api/v1/http/headers?q=https%3A%2F%2Flink.jnkus.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.

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