HTTP headers
HTTP /api/v1/http/headersCapture every response header, follow redirects, time each hop.
https://github.com/orgs/community/discussions/205975
200
2 hops
653 ms
Redirect chain
-
301
https://classroom.github.com272 ms -
200
https://github.com/orgs/community/discussions/205975333 ms
Final response headers (18)
| date | Sat, 31 Oct 2026 05:56:34 GMT |
| content-type | text/html; charset=utf-8 |
| cache-control | max-age=0, private, must-revalidate |
| content-security-policy | default-src 'none'; base-uri 'self'; child-src github.githubassets.com github.com/assets-cdn/worker/ github.com/assets/ gist.github.com/assets-cdn/worker/; connect-src 'self' uploads.github.com www.githubstatus.com collector.github.com raw.githubusercontent.com api.github.com github-cloud.s3.amazonaws.com github-production-repository-file-5c1aeb.s3.amazonaws.com github-production-upload-manifest-file-7fdce7.s3.amazonaws.com github-production-user-asset-6210df.s3.amazonaws.com *.rel.tunnels.api.visualstudio.com wss://*.rel.tunnels.api.visualstudio.com github.githubassets.com objects-origin.githubusercontent.com copilot-proxy.githubusercontent.com proxy.individual.githubcopilot.com proxy.business.githubcopilot.com proxy.enterprise.githubcopilot.com *.actions.githubusercontent.com wss://*.actions.githubusercontent.com productionresultssa0.blob.core.windows.net productionresultssa1.blob.core.windows.net productionresultssa2.blob.core.windows.net productionresultssa3.blob.core.windows.net productionresultssa4.blob.core.windows.net productionresultssa5.blob.core.windows.net productionresultssa6.blob.core.windows.net productionresultssa7.blob.core.windows.net productionresultssa8.blob.core.windows.net productionresultssa9.blob.core.windows.net productionresultssa10.blob.core.windows.net productionresultssa11.blob.core.windows.net productionresultssa12.blob.core.windows.net productionresultssa13.blob.core.windows.net productionresultssa14.blob.core.windows.net productionresultssa15.blob.core.windows.net productionresultssa16.blob.core.windows.net productionresultssa17.blob.core.windows.net productionresultssa18.blob.core.windows.net productionresultssa19.blob.core.windows.net productionresultssa30.blob.core.windows.net productionresultssa31.blob.core.windows.net productionresultssa32.blob.core.windows.net github-production-repository-image-32fea6.s3.amazonaws.com github-production-release-asset-2e65be.s3.amazonaws.com insights.github.com wss://alive.github.com wss://alive-staging.github.com api.githubcopilot.com api.individual.githubcopilot.com api.business.githubcopilot.com api.enterprise.githubcopilot.com wss://production-copilot-host.webpubsub.azure.com wss://production-copilot-host-centralus.webpubsub.azure.com wss://production-copilot-host-centralus-02.webpubsub.azure.com wss://production-copilot-host-westus.webpubsub.azure.com api.github.com/cmc_internal/api/; font-src github.githubassets.com; form-action 'self' github.com gist.github.com copilot-workspace.githubnext.com objects-origin.githubusercontent.com; frame-ancestors 'none'; frame-src viewscreen.githubusercontent.com notebooks.githubusercontent.com; img-src 'self' data: blob: github.githubassets.com media.githubusercontent.com camo.githubusercontent.com identicons.github.com avatars.githubusercontent.com private-avatars.githubusercontent.com github-cloud.s3.amazonaws.com objects.githubusercontent.com release-assets.githubusercontent.com secured-user-images.githubusercontent.com user-images.githubusercontent.com private-user-images.githubusercontent.com opengraph.githubassets.com repository-images.githubusercontent.com marketplace-screenshots.githubusercontent.com copilotprodattachments.blob.core.windows.net/github-production-copilot-attachments/ github-production-user-asset-6210df.s3.amazonaws.com customer-stories-feed.github.com spotlights-feed.github.com explore-feed.github.com *.googleusercontent.com objects-origin.githubusercontent.com *.githubusercontent.com; manifest-src 'self'; media-src github.com user-images.githubusercontent.com secured-user-images.githubusercontent.com private-user-images.githubusercontent.com github-production-user-asset-6210df.s3.amazonaws.com gist.github.com github.githubassets.com; script-src github.githubassets.com 'sha256-6AKuI+cDd1MoUL1u4eqrA9PXmnPAkOB4h7421hPUUm0='; style-src 'unsafe-inline' github.githubassets.com; upgrade-insecure-requests; worker-src github.githubassets.com github.com/assets-cdn/worker/ github.com/assets/ gist.github.com/assets-cdn/worker/ |
| referrer-policy | no-referrer-when-downgrade |
| server-timing | discussion_layout-fragment;desc="discussion_layout fragment";dur=127.914352,content_1-fragment;desc="content_1 fragment";dur=95.569322,content_2-fragment;desc="content_2 fragment";dur=63.889379,sidebar_content-fragment;desc="sidebar_content fragment";dur=80.275115,nginx;desc="NGINX";dur=1.266919,glb;desc="GLB";dur=65.229867 |
| strict-transport-security | max-age=31536000; includeSubdomains; preload |
| vary | X-PJAX, X-PJAX-Container, Turbo-Visit, Turbo-Frame, X-Requested-With, X-GitHub-Client-Version, Sec-Fetch-Site,Accept-Encoding, Accept, X-Requested-With |
| x-content-type-options | nosniff |
| x-frame-options | deny |
| x-voltron-version | 353c4ef |
| x-xss-protection | 0 |
| server | github.com |
| content-encoding | gzip |
| accept-ranges | bytes |
| set-cookie | _gh_sess=YlEU3IjUJOPYDZ9LegUjzw4rHOtDUQhomAd6ZHj%2F7DTcLvSrmXhu3Eu3BFstEqUO864JeKtSeJ85ApBnfoDclPJXDadicU0QZ08xp9ETxY9ZUd1Foo4K8H%2BufqDW5ynfQVJG7d%2Fldqho7s7Z8iBske7BR%2BTZS7ON1UOLHZn36TlwPfQqKlPrxWNKwmsRE9KhdPUR1z2U%2FyNVSqa5kjGYAk6%2Bo57aWP49CNZtDM3yLC5Mt6Xq8Qp4qt82O%2BTKx4JZiZsOhvK5TDxKYZeQUrkrig%3D%3D--7Yc1bHrAEalQ%2Fw1N--1vr47U1YYvV0l7IndqBp2A%3D%3D; path=/; HttpOnly; secure; SameSite=Lax, _octo=GH1.1.1866777912.1793426194; expires=Sun, 31 Oct 2027 05:56:34 GMT; domain=.github.com; path=/; secure; SameSite=Lax, logged_in=no; expires=Sun, 31 Oct 2027 05:56:34 GMT; domain=.github.com; path=/; HttpOnly; secure; SameSite=Lax |
| x-github-request-id | 9166:3FC4E3:54BBE7E:7510DDA:6AE58312 |
| x-github-edge-region | fra |
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=classroom.github.com
curl -s '/api/v1/http/headers?q=classroom.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