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Allow Header Normalize
x402
Allow Header Normalize 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).
Normalizes and sorts HTTP Allow header method values into a canonical, deterministic form for validation and analysis.
Price / call$0.001
Success—
StatusUnknown
How this service works
Allow Header Normalize: Allow Header Normalize normalizes and sorts methods advertised by an Allow header from bounded caller-supplied values without an external provider. Call Allow Header Normalize 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 Allow Header Normalize as versioned deterministic JSON. Price: $0.001 USDC via x402 on Base. First-party, stateless,…
Output
Returns a versioned deterministic JSON object containing the normalized and sorted list of HTTP methods from the Allow header, the computed validation finding, and an explicit pass or advisory status indicating whether the header is well-formed.
Example use cases
Validate Allow header before caching
“I'm about to cache a server response and the Allow header says 'post, GET, options, DELETE' — can you normalize and sort those methods into a clean canonical form so I store them consistently?”
Normalize Allow header before retry logic
“Before I set up retry logic for this API, can you normalize the Allow header 'PUT, patch, GET, OPTIONS, POST' into its canonical sorted form so I know exactly which methods are actually supported?”
Audit Allow header in API response
“I got an Allow header back from a web endpoint that reads 'delete,get,POST,Options' — can you normalize and sort it into a proper canonical format and tell me if it looks valid?”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/allow-header-normalizeWhen to prefer
Choose this endpoint when you need a stateless, deterministic, versioned normalization of an HTTP Allow header before caching, redirecting, retrying, or programmatically inspecting a web response. Ideal for agents that need consistent, canonical representation of server-advertised methods without building custom parsing logic.
Side effects
- Malformed or empty header string returns advisory/fail status with finding detail
- Header exceeding 8192 character limit rejected
- Non-HTTP-method tokens in header may trigger advisory status
- Payment failure or insufficient USDC balance blocks request
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| header | string | Header supplied to Allow Header Normalize; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"methods": [
"GET",
"OPTIONS",
"POST"
],
"normalized": "GET, OPTIONS, POST"
},
"schema": "delx/util-allow-header-normalize/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "0ecd36e96bbca98170b9eedc601e2bf858ebd547ce42de08db555b94ebabf822",
"external_calls": 0
},
"operation": "web_reliability:allow_header_normalize"
}
}Tags
x402
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