HTTP headers
HTTP /api/v1/http/headersCapture every response header, follow redirects, time each hop.
https://accounts.google.com/v3/signin/identifier?opparams=%253Fcred_ref%253Dtrue%2526hd%253Dgoogle.com&dsh=S-518000556%3A1789519618728204&client_id=761377308534.apps.googleusercontent.com&hd=google.com&o2v=1&redirect_uri=https%3A%2F%2Flogin.corp.google.com%2Foauth&response_type=code&scope=openid+email&service=lso&state=c%3D1%26s%3Dm.gutsdev.corp.google.com%3A443%2Fuberproxy%2F%26d%3Dhttps%3A%2F%2Fm.gutsdev.corp.google.com%2F%3Fupxsrf%253DAM2vRLkSEhTExbyzEXYE6JHppHQJxun84HoYR_y12eK0C3vNGQ%25253A1789519618606%26authLevel%3D1500%26maxAge%3D1200%26ssoformat%3DCORP_SSO%26x%3DALBF4GSLTg0otJj-AZzFYwKmN0OW61VhTI52ojEXlxXrXLfmIQ%3A1789519618667&flowName=GeneralOAuthLite&continue=https%3A%2F%2Faccounts.google.com%2Fsignin%2Foauth%2Flegacy%2Fconsent%3Fauthuser%3Dunknown%26part%3DAJi8hAPo9j2u0js4jA5teVpvBJFQqlltHDqriGIfOT26RVSOvSNEcRV9fXA60_odH1pV6oDItmTqwqRwzmdiNfkS49LQ0-sNpzZT2zsXVI9_8koleMKZq5wAz392mwsKiQCQ2SIi9_hwv2tTnVqxOyjpRghGrtfkmuWPyAgiqoVnwZrx5eVORCG1DpReD1z_VLInkYirbKlsV40qS6I-QUvcGZk8nEFcA56n4xvMM-9qtssVzgug9goya08TD6FKG7wOqOi4RCa9KNV9IUSLNGKPmz-4BRIYWa6lfR-2hKRG56pTFz6kMt9E9raNaTN1gtOEATCdWFkNDdT56uaAWGJENWxFCmUSh2O7exZHi68j7h7MCi-NJd6h_ECfG5eK8396Vw1fHSTkAA2-5wUdwxuOn72ckOG7PZy8zh_TWGvxjCygMGeapU0%26flowName%3DGeneralOAuthFlow%26as%3DS-518000556%253A1789519618728204%26client_id%3D761377308534.apps.googleusercontent.com%23&app_domain=https%3A%2F%2Flogin.corp.google.com&rart=ANgoxcecCLJrYy9m8EE25oe0AWdErc6kRtkME8dLukFYvFFR4oKwq7VdTb2WKwnFCfZHp40a_1MSmFUWbqfSUBVipfXnZsb4hQ2WommLLU3f6puNYnDPV1Y
200
4 hops
328 ms
Redirect chain
-
302
https://m.gutsdev.corp.google.com65 ms -
302
https://login.corp.google.com/request?authLevel=1500&c=1&d=https%3A%2F%2Fm.gutsdev.corp.google.com%2F%3Fupxsrf%3DAM2vRLkSEhTExbyzEXYE6JHppHQJxun84HoYR_y12eK0C3vNGQ%253A1789519618606&maxAge=1200&s=m.gutsdev.corp.google.com%3A443%2Fuberproxy%2F54 ms -
302
https://accounts.google.com/o/oauth2/auth?client_id=761377308534.apps.googleusercontent.com&redirect_uri=https://login.corp.google.com/oauth&response_type=code&scope=openid+email&state=c%3D1%26s%3Dm.gutsdev.corp.google.com:443/uberproxy/%26d%3Dhttps://m.gutsdev.corp.google.com/?upxsrf%253DAM2vRLkSEhTExbyzEXYE6JHppHQJxun84HoYR_y12eK0C3vNGQ%25253A1789519618606%26authLevel%3D1500%26maxAge%3D1200%26ssoformat%3DCORP_SSO%26x%3DALBF4GSLTg0otJj-AZzFYwKmN0OW61VhTI52ojEXlxXrXLfmIQ:1789519618667&hd=google.com&cred_ref=true81 ms -
200
https://accounts.google.com/v3/signin/identifier?opparams=%253Fcred_ref%253Dtrue%2526hd%253Dgoogle.com&dsh=S-518000556%3A1789519618728204&client_id=761377308534.apps.googleusercontent.com&hd=google.com&o2v=1&redirect_uri=https%3A%2F%2Flogin.corp.google.com%2Foauth&response_type=code&scope=openid+email&service=lso&state=c%3D1%26s%3Dm.gutsdev.corp.google.com%3A443%2Fuberproxy%2F%26d%3Dhttps%3A%2F%2Fm.gutsdev.corp.google.com%2F%3Fupxsrf%253DAM2vRLkSEhTExbyzEXYE6JHppHQJxun84HoYR_y12eK0C3vNGQ%25253A1789519618606%26authLevel%3D1500%26maxAge%3D1200%26ssoformat%3DCORP_SSO%26x%3DALBF4GSLTg0otJj-AZzFYwKmN0OW61VhTI52ojEXlxXrXLfmIQ%3A1789519618667&flowName=GeneralOAuthLite&continue=https%3A%2F%2Faccounts.google.com%2Fsignin%2Foauth%2Flegacy%2Fconsent%3Fauthuser%3Dunknown%26part%3DAJi8hAPo9j2u0js4jA5teVpvBJFQqlltHDqriGIfOT26RVSOvSNEcRV9fXA60_odH1pV6oDItmTqwqRwzmdiNfkS49LQ0-sNpzZT2zsXVI9_8koleMKZq5wAz392mwsKiQCQ2SIi9_hwv2tTnVqxOyjpRghGrtfkmuWPyAgiqoVnwZrx5eVORCG1DpReD1z_VLInkYirbKlsV40qS6I-QUvcGZk8nEFcA56n4xvMM-9qtssVzgug9goya08TD6FKG7wOqOi4RCa9KNV9IUSLNGKPmz-4BRIYWa6lfR-2hKRG56pTFz6kMt9E9raNaTN1gtOEATCdWFkNDdT56uaAWGJENWxFCmUSh2O7exZHi68j7h7MCi-NJd6h_ECfG5eK8396Vw1fHSTkAA2-5wUdwxuOn72ckOG7PZy8zh_TWGvxjCygMGeapU0%26flowName%3DGeneralOAuthFlow%26as%3DS-518000556%253A1789519618728204%26client_id%3D761377308534.apps.googleusercontent.com%23&app_domain=https%3A%2F%2Flogin.corp.google.com&rart=ANgoxcecCLJrYy9m8EE25oe0AWdErc6kRtkME8dLukFYvFFR4oKwq7VdTb2WKwnFCfZHp40a_1MSmFUWbqfSUBVipfXnZsb4hQ2WommLLU3f6puNYnDPV1Y63 ms
Final response headers (22)
| content-type | text/html; charset=utf-8 |
| x-frame-options | DENY |
| set-cookie | __Host-GAPS=1:dfxEVe7s21wNssBZToIETcnk_3UJsg:ssqIWdoSRJGY66La; Expires=Fri, 15-Sep-2028 00:46:58 GMT; Path=/; Secure; HttpOnly; Priority=HIGH |
| vary | Sec-Fetch-Dest, Sec-Fetch-Mode, Sec-Fetch-Site |
| x-ua-compatible | IE=edge |
| cache-control | no-cache, no-store, max-age=0, must-revalidate |
| pragma | no-cache |
| expires | Mon, 01 Jan 1990 00:00:00 GMT |
| date | Wed, 16 Sep 2026 00:46:58 GMT |
| strict-transport-security | max-age=31536000; includeSubDomains |
| report-to | {"group":"AccountsSignInUi","max_age":2592000,"endpoints":[{"url":"https://csp.withgoogle.com/csp/report-to/AccountsSignInUi"}]} |
| accept-ch | Sec-CH-UA-Arch, Sec-CH-UA-Bitness, Sec-CH-UA-Full-Version, Sec-CH-UA-Full-Version-List, Sec-CH-UA-Model, Sec-CH-UA-WoW64, Sec-CH-UA-Form-Factors, Sec-CH-UA-Platform, Sec-CH-UA-Platform-Version |
| content-security-policy | require-trusted-types-for 'script';report-uri /v3/signin/_/AccountsSignInUi/cspreport, script-src 'report-sample' 'nonce-sZJ_ItUZAoDSb9HZ4F-IWg' 'unsafe-inline';object-src 'none';base-uri 'self';report-uri /v3/signin/_/AccountsSignInUi/cspreport;worker-src 'self' |
| cross-origin-opener-policy-report-only | same-origin; report-to="AccountsSignInUi" |
| cross-origin-resource-policy | same-site |
| permissions-policy | ch-ua-arch=*, ch-ua-bitness=*, ch-ua-full-version=*, ch-ua-full-version-list=*, ch-ua-model=*, ch-ua-wow64=*, ch-ua-form-factors=*, ch-ua-platform=*, ch-ua-platform-version=* |
| reporting-endpoints | default="/v3/signin/_/AccountsSignInUi/web-reports?context=eJwNw11IU2EABuAx_V5CvJj9mC2QsasWaHORGQVRkrLm5g5nx9lET9omDmLT7UxIo_zBIK0IyhrVVQQaolIXXQj9XBQqomIuOq2wLgoSCzObGHnR-8CTo2ftzzEbvPvMhlfWCeOJ-q_GU3wnd9l4j_s-zIlbrD2cFz3cz0luObsgznOJ5a04zlX-ReHlWEFKdLGtLCWK-LVNF1P8u0MXpk5dlG_oopLz0x-FmadTn8Qsb3U5Yeh24nulCz_48owLvZz57MJfHlqsgq3YjSLeiLuRrbmxcsWDVR4Z9GCcx55V4yln_6zG414vRjnNS_zmvRfTrFoknONDPgnl_OiGhGGOvpQQ51-7ZPxhU4GMnbxWKiPDp4_J8PC3RhnLvMlbvKNJxm5uVX3QOHrRh7VNHzLckafgEreHFawMKFjltkkFCe6fVdD9vAZ9fI1v8l2-zzV7_Qjw6G0_nnAy7ccDPrynFkf55EgtKjj47wwmLAG84AZnAAe_BCAV1uGqtQ7XeXvutp65oXcwDa8PJLOsB5qibWo4GIpoYe1Ccywa0UKRYGNCa0mE46FYeyimOuyOUvuREkexvUxttf8HqNfF8g" |
| content-encoding | gzip |
| server | ESF |
| x-xss-protection | 0 |
| x-content-type-options | nosniff |
| alt-svc | h3=":443"; ma=2592000,h3-29=":443"; ma=2592000 |
Tech stack
HTTP/3 (QUIC)
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=m.gutsdev.corp.google.com
curl -s '/api/v1/http/headers?q=m.gutsdev.corp.google.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