host.tools

HTTP headers

HTTP /api/v1/http/headers

Capture every response header, follow redirects, time each hop.

Try: https://host.com https://checkhost.com https://hostinfo.com https://crypt.tools
Related: DNS lookup (dig) DNS propagation Domain WHOIS SSL certificate inspector HTTP headers Security headers grader MX lookup SPF tester DMARC tester
https://forms.cloud.microsoft/Pages/ResponsePage.aspx?id=v4j5cvGGr0GRqy180BHbR8MwQgkfxNNItIhCnR0v_a9UME9CMDFTTFpITU9GWlM4VUpURVJNMzkxUSQlQCN0PWcu 200 4 hops 1816 ms
Redirect chain
  1. 301 https://maintainers.github.com 272 ms
  2. 301 https://gh.io/maintainers-signup/ 668 ms
  3. 301 https://forms.microsoft.com/Pages/ResponsePage.aspx?id=v4j5cvGGr0GRqy180BHbR8MwQgkfxNNItIhCnR0v_a9UME9CMDFTTFpITU9GWlM4VUpURVJNMzkxUSQlQCN0PWcu 94 ms
  4. 200 https://forms.cloud.microsoft/Pages/ResponsePage.aspx?id=v4j5cvGGr0GRqy180BHbR8MwQgkfxNNItIhCnR0v_a9UME9CMDFTTFpITU9GWlM4VUpURVJNMzkxUSQlQCN0PWcu 185 ms
Final response headers (25)
cache-control no-cache, no-store, must-revalidate
pragma no-cache
content-type text/html; charset=utf-8
content-encoding br
expires 0
vary Accept-Encoding
set-cookie FormsWebSessionId=82b20e91-64b6-40dc-a998-6b0aec751fcc; max-age=2592000; path=/; secure; samesite=none; httponly, MUID=15C41B6D565569F304850CB869136BDE; max-age=33696000; path=/; secure; samesite=none, FormsWebSessionId=e1b64961-abea-4f52-b37d-a60ee41d79de; max-age=2592000; path=/; secure; samesite=none; httponly, MUID=0E5D5C81679E60A614954B5458CA6210; max-age=33696000; path=/; secure; samesite=none, __RequestVerificationToken=oAqINRJnkpFnn7fEUIiH4JO7WwiwAY_1Ee3j-IrFPCdXujb2UL43XBHckU4kUt-AXEUO_PwMhLnaTnJxdJ7kZLCKa57e_fBwUMDHcJ-FPvI1; path=/; secure; samesite=none; httponly
strict-transport-security max-age=2592000; includeSubDomains
x-routingofficecluster frc-frcprod2.forms.osi.office.net, wcus-wcusmsit1.forms.osi.office.net
x-routingofficefe office-forms-singlebox-8986d74b8-njbzn, office-forms-singlebox-6ff8564fbd-bqlmz
x-routingofficeversion 16.0.20508.42050, 16.0.20514.42050
x-routingsessionid 77a92e6c-448a-4ce5-b646-558fa52adcac
x-routingcorrelationid 887bad35-d2ae-4ed0-8dbf-25c96b3fd0be
x-correlationid 887bad35-d2ae-4ed0-8dbf-25c96b3fd0be
x-officecluster wcus-wcusmsit1.forms.osi.office.net
x-officefe office-forms-singlebox-6ff8564fbd-bqlmz
x-officeversion 16.0.20514.42050
x-usersessionid 77a92e6c-448a-4ce5-b646-558fa52adcac
report-to { "group": "endpoint-1", "max_age": 108864000, "endpoints": [ { "url": "https://cspv2.core.microsoft/report/d9debafb-bbac-42b5-8e6e-df1f1dd85343/Forms-PROD" }] }
content-security-policy object-src 'none';script-src 'nonce-ac931796-27b5-47ba-a955-996b0be0723f' 'unsafe-inline' 'unsafe-eval' 'strict-dynamic' https:;base-uri 'none';require-trusted-types-for 'script'; report-uri https://cspv2.core.microsoft/report/d9debafb-bbac-42b5-8e6e-df1f1dd85343/Forms-PROD;report-to endpoint-1;
x-robots-tag noindex, nofollow
link <https://forms.cloud.microsoft/cdn>; rel=preconnect; crossorigin=anonymous
x-cache CONFIG_NOCACHE
x-msedge-ref Ref A: CEF35B8E21B64FE99A0CF43152C23055 Ref B: FRA261071512025 Ref C: 2026-09-15T23:46:11Z
date Tue, 15 Sep 2026 23:46:11 GMT
How to use HTTP headers
  1. 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. 2
    Click "Inspect"

    host.tools issues real probes (DNS, HTTP, TCP, TLS, WHOIS where applicable) and renders the result in milliseconds.

  3. 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=maintainers.github.com 
curl -s '/api/v1/http/headers?q=maintainers.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.

See pricing Tour monitors
  • ✓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