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ipv4.fr HTTP Headers Fetch
x402
ipv4.fr HTTP Headers Fetch is a paid API for AI agents from ipv4.fr, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-29).
Fetches HTTP response headers from any URL or domain via a server-side GET request
Price / call$0.003
Success—
StatusUnknown
How this service works
Fast, reliable network tools API. IP geolocation, DNS lookup, SSL check, WHOIS, email validation, port scan. Free tier available.
Output
Returns a JSON object containing the target URL, the HTTP status code of the response, and a dictionary of all HTTP response headers returned by the server (e.g. server, content-type, cache-control, strict-transport-security, x-frame-options, etc.).
Example use cases
Security header audit for a site
“Check what HTTP security headers https://mybusiness.com is returning — I want to see if HSTS, Content-Security-Policy, and X-Frame-Options are set.”
Identify server technology stack
“What web server software is running behind https://competitor.com? Fetch its response headers so I can see the Server and X-Powered-By fields.”
Debugging CDN caching behavior
“Fetch the response headers for https://api.myapp.io/data and tell me what Cache-Control and X-Cache headers it's returning — I'm trying to figure out why responses aren't being cached.”
Technical details
Endpoint
GEThttps://ipv4.fr/x402/v1/headers?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to inspect the actual HTTP response headers a server sends for a given URL without making the request client-side. Ideal for security audits (checking HSTS, CSP, X-Frame-Options), debugging caching behavior, identifying server technology, or verifying CDN/proxy configuration. Prefer this over browser-based inspection when you need programmatic, server-side header retrieval at scale.
Side effects
- Invalid or unreachable URL returns an error or non-200 status
- Timeout if the target server is slow or unresponsive
- HTTPS URLs with invalid SSL certificates may fail or return error
- Private/internal IP addresses may be blocked for security
- Redirect chains may or may not be followed depending on implementation
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"url": "https://example.com",
"status": 200,
"headers": {
"server": "ECS"
}
}
}Tags
x402
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