host.tools

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://docs.github.com/en 200 2 hops 131 ms
Redirect chain
  1. 302 https://docs.github.com 45 ms
  2. 200 https://docs.github.com/en 43 ms
Final response headers (30)
access-control-allow-origin *
content-security-policy default-src 'none';prefetch-src 'self';connect-src 'self' https://collector.githubapp.com;font-src 'self' data:;img-src 'self' github.com *.github.com *.githubusercontent.com *.githubassets.com data: placehold.it;object-src 'self';script-src 'self' github.com *.github.com *.githubusercontent.com *.githubassets.com 'self' data: 'sha256-dspnkRAwFNI4G3CK/poQ1CoGlM1rtnGvq1TX7FlQtM4=';script-src-attr 'self';frame-src 'self' github.com *.github.com *.githubusercontent.com *.githubassets.com https://support.github.com;frame-ancestors 'self' github.com *.github.com *.githubusercontent.com *.githubassets.com;style-src 'self' github.com *.github.com *.githubusercontent.com *.githubassets.com 'self' 'unsafe-inline' data:;child-src 'self';manifest-src 'self';upgrade-insecure-requests;base-uri 'self';form-action 'self'
cross-origin-opener-policy same-origin
cross-origin-resource-policy same-origin
origin-agent-cluster ?1
referrer-policy no-referrer-when-downgrade
x-content-type-options nosniff
x-dns-prefetch-control off
x-download-options noopen
x-frame-options SAMEORIGIN
x-permitted-cross-domain-policies none
x-xss-protection 0
cache-control public, max-age=60
x-powered-by Next.js
content-type text/html; charset=utf-8
x-github-backend Kubernetes
x-github-request-id B768:EC590:1ED14C1:2223C0C:6AA9CE46
x-github-edge-region iad
content-encoding br
via 1.1 varnish, 1.1 varnish
accept-ranges bytes
date Tue, 15 Sep 2026 23:09:13 GMT
age 458
x-served-by cache-iad-kjyo7100085-IAD, cache-fra-etou8220134-FRA
x-cache HIT, HIT
x-cache-hits 2, 1
x-timer S1789513754.808148,VS0,VE1
vary accept, Accept-Encoding
strict-transport-security max-age=31557600
content-length 13746
Tech stack
FastlyX-Powered-By: Next.jsNext.js
How to use HTTP headers
  1. 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. 2
    Click "Inspect"

    host.tools issues real probes (DNS, HTTP, TCP, TLS, WHOIS where applicable) and renders the result in milliseconds.

  3. 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=docs.github.com 
curl -s '/api/v1/http/headers?q=docs.github.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