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Forwarded Header Parse
x402
Forwarded Header Parse is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).
Parses and validates RFC 7239 Forwarded HTTP header values, returning normalized evidence and a pass/advisory status as deterministic versioned JSON.
Price / call$0.001
Success—
StatusUnknown
How this service works
Forwarded Header Parse: Forwarded Header Parse parses bounded standardized Forwarded header elements from bounded caller-supplied values without an external provider. Call Forwarded Header Parse before accepting, caching, redirecting, or retrying a caller-supplied web response. Returns normalized web evidence, the computed finding, and an explicit pass or advisory status for Forwarded Header Parse as versioned deterministic JSON. Price: $0.001 USDC via x402 on Base. First-party, stateless, memo…
Output
A versioned deterministic JSON object containing: normalized Forwarded header elements (for, by, proto, host fields), the computed finding describing what was parsed, and an explicit pass or advisory status indicating whether the header is well-formed and safe to use.
Example use cases
Validate proxy header before caching
“Before I cache this response, check whether the Forwarded header 'for=10.0.0.1;proto=https;host=myapp.example.com' is valid and normalized — I need a pass or advisory verdict.”
Extract originating IP from load balancer
“Parse this Forwarded header from our load balancer and tell me what client IP and protocol it reports: 'for="192.168.1.100:4321";proto=https;by=203.0.113.1'.”
Security review of caller-supplied header
“I'm about to redirect based on a caller-supplied Forwarded header value — can you analyze 'for=_hidden;proto=http;host=internal.corp' and flag anything suspicious or non-standard before I proceed?”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/forwarded-header-parseWhen to prefer
Use this endpoint when you need deterministic, stateless, first-party parsing of RFC 7239 Forwarded headers without retaining input data — particularly before accepting, caching, redirecting, or retrying a caller-supplied web response. Prefer it over custom parsing logic when you need a normalized, versioned JSON result with an explicit pass/advisory verdict for auditability or downstream decision-making.
Side effects
- Header string exceeds 8192-character limit — request rejected
- Malformed or unparseable Forwarded header — advisory status returned with finding detail
- Empty or missing header field — may return advisory with explanation
- Payment failure via x402 — call not processed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| header | string | Header supplied to Forwarded Header Parse; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"count": 1,
"entries": [
{
"value": "for=192.0.2.43",
"parameters": {
"host": "example.com",
"proto": "https"
}
}
]
},
"schema": "delx/util-forwarded-header-parse/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "b67c372b032dcbad87778aa97564468e1c93a1af08bcce74c0c0f12b8747427f",
"external_calls": 0
},
"operation": "web_reliability:forwarded_header_parse"
}
}Tags
x402
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