HTTP headers
HTTP /api/v1/http/headersCapture every response header, follow redirects, time each hop.
https://auth.single10.app/if/flow/default-authentication-flow/?next=%2Fapplication%2Fo%2Fauthorize%2F%3Fclient_id%3DGEQsxZxAgfZjwZcDGDb4ARY4m7yvxpO90sGstPeb%26redirect_uri%3Dhttps%253A%252F%252Fhome.single10.app%252Foutpost.goauthentik.io%252Fcallback%253FX-authentik-auth-callback%253Dtrue%26response_type%3Dcode%26scope%3Dopenid%2Bemail%2Bentitlements%2Bak_proxy%2Bprofile%26state%3DeyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJnb2F1dGhlbnRpay5pby9vdXRwb3N0L0dFUXN4WnhBZ2ZaandaY0RHRGI0QVJZNG03eXZ4cE85MHNHc3RQZWIiLCJzaWQiOiJQMlVKM05IQkxSNkxRN01RSEVIQ0FIUVdVQUVDNVBaV1lINURKUUU0Q0dQTUs3TldPMktRIiwic3RhdGUiOiJmWmE4eGgzdW5MdGFUVHVFZzg1ZGFDdHpWNGdsX3dCVFBrWTdSaEs3WXM0IiwicmVkaXJlY3QiOiJodHRwczovL2hvbWUuc2luZ2xlMTAuYXBwLyJ9.2UTn5mxMOtc5TES10FHQq-fqBJFU6lXI-Pz6YgT13O0
200
4 hops
2879 ms
Redirect chain
-
302
https://home.single10.app579 ms -
302
https://auth.single10.app/application/o/authorize/?client_id=GEQsxZxAgfZjwZcDGDb4ARY4m7yvxpO90sGstPeb&redirect_uri=https%3A%2F%2Fhome.single10.app%2Foutpost.goauthentik.io%2Fcallback%3FX-authentik-auth-callback%3Dtrue&response_type=code&scope=openid+email+entitlements+ak_proxy+profile&state=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJnb2F1dGhlbnRpay5pby9vdXRwb3N0L0dFUXN4WnhBZ2ZaandaY0RHRGI0QVJZNG03eXZ4cE85MHNHc3RQZWIiLCJzaWQiOiJQMlVKM05IQkxSNkxRN01RSEVIQ0FIUVdVQUVDNVBaV1lINURKUUU0Q0dQTUs3TldPMktRIiwic3RhdGUiOiJmWmE4eGgzdW5MdGFUVHVFZzg1ZGFDdHpWNGdsX3dCVFBrWTdSaEs3WXM0IiwicmVkaXJlY3QiOiJodHRwczovL2hvbWUuc2luZ2xlMTAuYXBwLyJ9.2UTn5mxMOtc5TES10FHQq-fqBJFU6lXI-Pz6YgT13O0557 ms -
302
https://auth.single10.app/flows/-/default/authentication/?next=/application/o/authorize/%3Fclient_id%3DGEQsxZxAgfZjwZcDGDb4ARY4m7yvxpO90sGstPeb%26redirect_uri%3Dhttps%253A%252F%252Fhome.single10.app%252Foutpost.goauthentik.io%252Fcallback%253FX-authentik-auth-callback%253Dtrue%26response_type%3Dcode%26scope%3Dopenid%2Bemail%2Bentitlements%2Bak_proxy%2Bprofile%26state%3DeyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJnb2F1dGhlbnRpay5pby9vdXRwb3N0L0dFUXN4WnhBZ2ZaandaY0RHRGI0QVJZNG03eXZ4cE85MHNHc3RQZWIiLCJzaWQiOiJQMlVKM05IQkxSNkxRN01RSEVIQ0FIUVdVQUVDNVBaV1lINURKUUU0Q0dQTUs3TldPMktRIiwic3RhdGUiOiJmWmE4eGgzdW5MdGFUVHVFZzg1ZGFDdHpWNGdsX3dCVFBrWTdSaEs3WXM0IiwicmVkaXJlY3QiOiJodHRwczovL2hvbWUuc2luZ2xlMTAuYXBwLyJ9.2UTn5mxMOtc5TES10FHQq-fqBJFU6lXI-Pz6YgT13O0522 ms -
200
https://auth.single10.app/if/flow/default-authentication-flow/?next=%2Fapplication%2Fo%2Fauthorize%2F%3Fclient_id%3DGEQsxZxAgfZjwZcDGDb4ARY4m7yvxpO90sGstPeb%26redirect_uri%3Dhttps%253A%252F%252Fhome.single10.app%252Foutpost.goauthentik.io%252Fcallback%253FX-authentik-auth-callback%253Dtrue%26response_type%3Dcode%26scope%3Dopenid%2Bemail%2Bentitlements%2Bak_proxy%2Bprofile%26state%3DeyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJnb2F1dGhlbnRpay5pby9vdXRwb3N0L0dFUXN4WnhBZ2ZaandaY0RHRGI0QVJZNG03eXZ4cE85MHNHc3RQZWIiLCJzaWQiOiJQMlVKM05IQkxSNkxRN01RSEVIQ0FIUVdVQUVDNVBaV1lINURKUUU0Q0dQTUs3TldPMktRIiwic3RhdGUiOiJmWmE4eGgzdW5MdGFUVHVFZzg1ZGFDdHpWNGdsX3dCVFBrWTdSaEs3WXM0IiwicmVkaXJlY3QiOiJodHRwczovL2hvbWUuc2luZ2xlMTAuYXBwLyJ9.2UTn5mxMOtc5TES10FHQq-fqBJFU6lXI-Pz6YgT13O0601 ms
Final response headers (12)
| alt-svc | h3=":443"; ma=2592000 |
| content-encoding | deflate |
| content-language | en |
| content-type | text/html; charset=utf-8 |
| date | Sat, 09 May 2026 07:12:28 GMT |
| referrer-policy | same-origin |
| vary | Accept-Encoding, Accept-Language, Cookie |
| via | 1.1 Caddy |
| x-authentik-id | 334d260c3fb34c85b56c6be5810bb6b1 |
| x-content-type-options | nosniff |
| x-frame-options | DENY |
| x-powered-by | authentik |
Tech stack
X-Powered-By: authentikHTTP/3 (QUIC)
How to use HTTP headers
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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=home.single10.app
curl -s '/api/v1/http/headers?q=home.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.
- ✓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