HTTP headers
HTTP /api/v1/http/headersCapture every response header, follow redirects, time each hop.
https://visualstudio.microsoft.com/vs/github/
200
2 hops
308 ms
Redirect chain
-
301
https://visualstudio.github.com261 ms -
200
https://visualstudio.microsoft.com/vs/github/25 ms
Final response headers (20)
| server | nginx |
| content-type | text/html; charset=UTF-8 |
| link | <https://visualstudio.microsoft.com/?p=176603>; rel=shortlink |
| server-timing | wp-before-template;dur=102.6 |
| x-powered-by | WP Engine |
| x-cacheable | SHORT |
| x-cache-group | normal |
| content-encoding | gzip |
| access-control-allow-origin | https://cdn-assets-prod.s3.amazonaws.com |
| content-security-policy | upgrade-insecure-requests, script-src 'self' 'unsafe-inline' 'unsafe-eval' https: |
| feature-policy | geolocation 'none'; midi 'none'; sync-xhr 'none'; microphone 'none'; camera 'none'; magnetometer 'none'; gyroscope 'none'; payment 'none', geolocation 'none'; midi 'none'; sync-xhr 'none'; microphone 'none'; camera 'none'; magnetometer 'none'; gyroscope 'none'; fullscreen 'self' https://www.youtube.com https://mediastream.microsoft.com; payment 'none' |
| x-content-type-options | nosniff, nosniff |
| x-xss-protection | 1; mode=block, 1; mode=block |
| content-length | 53158 |
| cache-control | must-revalidate, max-age=600 |
| date | Tue, 15 Sep 2026 23:09:22 GMT |
| vary | Accept-Encoding |
| x-frame-options | SAMEORIGIN |
| referrer-policy | no-referrer-when-downgrade |
| strict-transport-security | max-age=15768000 ; includeSubDomains ; preload |
Tech stack
NginxX-Powered-By: WP Enginegenerator: performance-lab 4.2.0; plugins: webp-uploadsWordPress
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.
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2
Click "Inspect"
host.tools issues real probes (DNS, HTTP, TCP, TLS, WHOIS where applicable) and renders the result in milliseconds.
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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=visualstudio.github.com
curl -s '/api/v1/http/headers?q=visualstudio.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.
- ✓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