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Dev Reference – HTTP Header Lookup
x402
Dev Reference – HTTP Header Lookup is a paid API for AI agents from dev-reference.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-29).
Returns the purpose, direction (request/response), security notes, and IANA registration status for a named HTTP header field.
Price / call$0.02
Success—
StatusUnknown
How this service works
Explain an HTTP header: request or response, purpose, security notes, and its IANA registration status.
Output
A structured record containing the header's canonical name, direction (request or response), a plain-English summary of its purpose, a security note highlighting any risks or best practices, its IANA registration status (boolean and registry status string), a reference URL, and metadata such as the data freshness date and whether the result is degraded.
Example use cases
Security audit of response headers
“I'm reviewing our API's response headers — can you explain what the X-Content-Type-Options header does, whether it's a request or response header, and flag any security concerns?”
Developer documentation research
“I'm writing docs for our HTTP API — what's the purpose of the Accept header, what direction is it used in, and is it formally registered with IANA?”
Debugging unknown header behavior
“I keep seeing a Forwarded header in our server logs and I'm not sure what it does — can you look it up and tell me its purpose, direction, and registration status?”
Technical details
Endpoint
GEThttps://dev-reference.x402tookit.com/http-header?utm_source=zero.xyzWhen to prefer
Use this endpoint when an agent or developer needs authoritative, structured information about a specific HTTP header — including its semantics, direction, security implications, and IANA registration status — rather than a free-text web search. Ideal for documentation generation, security audits, and developer tooling where structured, reliable metadata is required.
Side effects
- Unknown or non-standard header name may return null fields or unregistered status
- Misspelled header name may produce empty or degraded result
- Very new or experimental headers may lack IANA registration data
- Network or upstream lookup failure may return a degraded flag with partial data
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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