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=S1996843667%3A1789527708068096&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%253DAM2vRLkRuT05oHd4gf52gl1CDWweECtCCY9AzER6NGhdO6Hs-w%25253A1789527707985%26authLevel%3D1500%26maxAge%3D1200%26ssoformat%3DCORP_SSO%26x%3DALBF4GTZ0iUYEBcRkPDn3pu_xdx4sWgWLC9JiZSAfSjz6X-d7A%3A1789527708036&flowName=GeneralOAuthLite&continue=https%3A%2F%2Faccounts.google.com%2Fsignin%2Foauth%2Flegacy%2Fconsent%3Fauthuser%3Dunknown%26part%3DAJi8hAM8JTOWM4b1uhwM4LkVbu7C25uHdxJozN3wYqi__6EjTvZK5cEh3eNbmE21WjfeQtVOWs2NgIJqShZqK9FMdX5qIIr4M6OtlyBZDZw91jEq_nAbRZpqYOMWo9-Q9U6SlgQAvhLkH7wowyXCY39_AjhZRMPh7gTn_aULOodZ3Z_ihuY4tyLqc9_Piq0NMUV9nELeaPb9kRTopiJYdGJeQ3P3BiPUU3VHMa8l38agvDGRED-sUgrr2l0C_S0BgC6Trkga6vzY6yCsRdbtRmMs3NzqodoYFqlIGmWZ-kZhozqtpBROL7Zwmh6ulcRkwffuzQLkeTu8rkXwfGqVRKslhaG5k-Y5PeubwJzgAHGxvYT1p_8BHY9bK1cO4IIOMpIlM0-6ahnUxAqJT7AOCo_w2Du8YNlqVYPf5SvieHLl_IbL-3cpX6E%26flowName%3DGeneralOAuthFlow%26as%3DS1996843667%253A1789527708068096%26client_id%3D761377308534.apps.googleusercontent.com%23&app_domain=https%3A%2F%2Flogin.corp.google.com&rart=ANgoxcdsPNhcyCxAiY4a1MHCWzDdz06SorBYbFMzrfYLKZeHN7FKirOO8M2RCc8D7yHQgPau5lpsAHd5UqECzYM-oq4324i8l5Q3uJqXcJTUPEfdtiDRLmM
200
4 hops
309 ms
Redirect chain
-
302
https://m.gutsdev.corp.google.com59 ms -
302
https://login.corp.google.com/request?authLevel=1500&c=1&d=https%3A%2F%2Fm.gutsdev.corp.google.com%2F%3Fupxsrf%3DAM2vRLkRuT05oHd4gf52gl1CDWweECtCCY9AzER6NGhdO6Hs-w%253A1789527707985&maxAge=1200&s=m.gutsdev.corp.google.com%3A443%2Fuberproxy%2F51 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%253DAM2vRLkRuT05oHd4gf52gl1CDWweECtCCY9AzER6NGhdO6Hs-w%25253A1789527707985%26authLevel%3D1500%26maxAge%3D1200%26ssoformat%3DCORP_SSO%26x%3DALBF4GTZ0iUYEBcRkPDn3pu_xdx4sWgWLC9JiZSAfSjz6X-d7A:1789527708036&hd=google.com&cred_ref=true68 ms -
200
https://accounts.google.com/v3/signin/identifier?opparams=%253Fcred_ref%253Dtrue%2526hd%253Dgoogle.com&dsh=S1996843667%3A1789527708068096&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%253DAM2vRLkRuT05oHd4gf52gl1CDWweECtCCY9AzER6NGhdO6Hs-w%25253A1789527707985%26authLevel%3D1500%26maxAge%3D1200%26ssoformat%3DCORP_SSO%26x%3DALBF4GTZ0iUYEBcRkPDn3pu_xdx4sWgWLC9JiZSAfSjz6X-d7A%3A1789527708036&flowName=GeneralOAuthLite&continue=https%3A%2F%2Faccounts.google.com%2Fsignin%2Foauth%2Flegacy%2Fconsent%3Fauthuser%3Dunknown%26part%3DAJi8hAM8JTOWM4b1uhwM4LkVbu7C25uHdxJozN3wYqi__6EjTvZK5cEh3eNbmE21WjfeQtVOWs2NgIJqShZqK9FMdX5qIIr4M6OtlyBZDZw91jEq_nAbRZpqYOMWo9-Q9U6SlgQAvhLkH7wowyXCY39_AjhZRMPh7gTn_aULOodZ3Z_ihuY4tyLqc9_Piq0NMUV9nELeaPb9kRTopiJYdGJeQ3P3BiPUU3VHMa8l38agvDGRED-sUgrr2l0C_S0BgC6Trkga6vzY6yCsRdbtRmMs3NzqodoYFqlIGmWZ-kZhozqtpBROL7Zwmh6ulcRkwffuzQLkeTu8rkXwfGqVRKslhaG5k-Y5PeubwJzgAHGxvYT1p_8BHY9bK1cO4IIOMpIlM0-6ahnUxAqJT7AOCo_w2Du8YNlqVYPf5SvieHLl_IbL-3cpX6E%26flowName%3DGeneralOAuthFlow%26as%3DS1996843667%253A1789527708068096%26client_id%3D761377308534.apps.googleusercontent.com%23&app_domain=https%3A%2F%2Flogin.corp.google.com&rart=ANgoxcdsPNhcyCxAiY4a1MHCWzDdz06SorBYbFMzrfYLKZeHN7FKirOO8M2RCc8D7yHQgPau5lpsAHd5UqECzYM-oq4324i8l5Q3uJqXcJTUPEfdtiDRLmM63 ms
Final response headers (22)
| content-type | text/html; charset=utf-8 |
| x-frame-options | DENY |
| vary | Sec-Fetch-Dest, Sec-Fetch-Mode, Sec-Fetch-Site |
| set-cookie | __Host-GAPS=1:v0CXSqtWU0w9mvLTv3ArfBEYqC8Nhg:prc5wnsNoJJlThpx; Expires=Fri, 15-Sep-2028 03:01:48 GMT; Path=/; Secure; HttpOnly; Priority=HIGH |
| 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 03:01:48 GMT |
| strict-transport-security | max-age=31536000; includeSubDomains |
| cross-origin-resource-policy | same-site |
| cross-origin-opener-policy-report-only | same-origin; report-to="AccountsSignInUi" |
| 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=* |
| 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 | script-src 'report-sample' 'nonce-ZhlzAeTpNYPIAPPsv8Iy-A' 'unsafe-inline';object-src 'none';base-uri 'self';report-uri /v3/signin/_/AccountsSignInUi/cspreport;worker-src 'self', require-trusted-types-for 'script';report-uri /v3/signin/_/AccountsSignInUi/cspreport |
| report-to | {"group":"AccountsSignInUi","max_age":2592000,"endpoints":[{"url":"https://csp.withgoogle.com/csp/report-to/AccountsSignInUi"}]} |
| reporting-endpoints | default="/v3/signin/_/AccountsSignInUi/web-reports?context=eJwNw1tIU3EAB-Cx_P8I62FmF5sQwycXaHORGgVlorLm5g5nx9miTtpOOJBNtzMhi7yhD3ZB6DbKJxFURKMeehDUlyItNMuJc0n1UJBYWJFi5EO_D770-R2H082G07lmw0TOuLHkwhdjGT_YvWp8xF3Lc-Iu6_1vRQf3cJzrL70TDVxgeS9OcaVvQXg4kpUQbWwtTog8fmFNimn-3ZIUpmtJUbqZFBW8P_VBmHkmsSJmebvNAUO7A98qnPjOrW-c6OSNT0785cGFSljzXcjjzagLaboLa91urPPIfTee8NjzKjzjtB9VGO70YJRT_JFfLnkww6pFwmU-5pVQyq8bJMzxwB0JQxyekhDln_tk_GFTloy9_KtQxgafPSnDzV9rZazyFm9zZp2MA9yoeqFz-LoXLRkKbnBzUMHaTQXr3PRKQYx7ZhW0T1Sji29xLz_kx1yd7YOfR-_58JTjKR_6uOhgDU7wmZEalHPg3zmMW_yY5IsOP45-9kM6dB57du3suz20CNP0VlzLOVIXblKDAS2kB_WrVyLhkK6FArUxvT4WjGqRZi2i2m32QtvxAnu-rVhttP0H6ArCJA" |
| 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=https%3A%2F%2Fm.gutsdev.corp.google.com
curl -s '/api/v1/http/headers?q=https%3A%2F%2Fm.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