Validate HTTP Canonical

seo.validate_http_canonical

ProductionBounded custom (Class B)Deterministicstrictfastv1.0.0

No network

Overview

Read Link canonical declarations from supplied headers. We never fetch a URL, run a script, or choose a winner. A successful call costs 1 execution credit.

HTTP and HTML canonicals are different sources; this owns the header.

Reliability

seo.validate_http_canonical is stable for identical input. Identical input always produces identical JSON. SEO_INPUT_REQUIRED means a required field is missing or has the wrong shape, so send the published object rather than a guessed map; retrying unchanged will not help. SEO_INPUT_TOO_LARGE means a value exceeds its ceiling, so trim it. SEO_HTML_MALFORMED means the HTML could not be parsed under the offline HTML contract, so fix the markup. SEO_XML_MALFORMED means the XML is not well-formed, so correct it. SEO_XML_DOCTYPE_NOT_ALLOWED means the XML includes a DOCTYPE declaration, so strip the DOCTYPE and resend; we refuse DTDs rather than expanding entities. SEO_JSONLD_MALFORMED means a JSON-LD block is not usable JSON, so correct it. SEO_PROFILE_UNKNOWN means the named profile is not bundled, so send one of the published profile ids. SEO_TOO_MANY_RECORDS means a list exceeded its ceiling, so split the batch. SEO_GRAPH_LIMIT_EXCEEDED means the graph exceeded its node or edge ceiling, so shrink it. SEO_INVALID_URL means a URL string is not a usable RFC 3986 URI, so send an absolute URI. SEO_OBSERVATION_INCOMPLETE means required observation coverage is missing, so add the missing evidence. SEO_INPUT_CONFLICT means two fields that cannot be used together were both supplied, so drop one. Retrying an unchanged request will not help.

Context footprint

Returns a compact structured record. A successful call costs 1 execution credit.

When to use it

When you already have a document URL plus Link headers and need HTTP canonical declarations parsed.

When you want HTML canonicals — use seo.extract_canonical — or headers still need capturing.

Scope

Note

Read Link canonical declarations from supplied headers.

Non-goals

Does not fetch a URL, resolve DNS, or run a browser
Does not predict ranking, choose a winner, or claim live index status
Does not fetch or prefer a source

Properties

IdempotentRetry safeStreaming supportedFile input supportedRequires external service

Capabilities

analysisparsing

Cost & billing

Flat rate per invocation

MetercallsBillable onsuccessCost per call1 credit

File handling

Accepts file_refProduces file_refMax input1 MB

How we handle your data

Sensitive output possible

What this means

This skill may receive sensitive content and may return submitted, transformed, extracted, or reformatted content.

Squillify guarantees

Runs inside Squillify
This skill runs inside Squillify.
Payloads are not sent to an external service by this skill.
Squillify does not permanently store submitted payloads.
Telemetry records metadata only, not submitted content.
Submitted payloads are not used for training.
Submitted payloads are not reviewed by humans.
This skill does not target sensitive data.
The response may contain submitted or transformed content.

Your responsibility

Squillify does not determine whether submitted content is sensitive. Your application is responsible for deciding what data it is allowed to submit. Your application is responsible for securing the response.

Read the Microskill Data Handling Policy

Input schema

Field	Type	Required	Description
documentUrl	string	Yes	Required. The documentUrl value for this offline analysis, up to 1 MiB.
headers	object	Yes	HTTP header map. Each property name is a header field; each value is the header text, at most 64 headers. Omit this map when you have no headers and we treat every header as absent.

Output schema

Field	Type	Required	Description
documentUrl	string	Yes	Required. Structured 'documentUrl' value produced by this offline analysis.
declarations	array	Yes	Required. Structured 'declarations' value. Objects expose named properties; arrays list bounded rows or strings produced from the supplied artifacts, up to 10,000 entries.
count	integer	Yes	Required. Structured 'count' value produced by this offline analysis.
selfReferential	boolean	Yes	Required. Structured 'selfReferential' value produced by this offline analysis.
findings	array	Yes	Array of 0 to 1000 finding objects. Each item has ruleId, severity (ERROR, WARNING, or INFO), certainty, subject {type, id}, message, evidence[{artifactId, path, actual}], and profile {id, checksumSha256}.

API contract

POST /v1/execute

curl

curl -sS -X POST "$BASE/v1/execute" -H "Authorization: Bearer $KEY" -H 'Content-Type: application/json' -d '{"skillKey":"seo.validate_http_canonical","input":{"documentUrl":"https://www.example.com/","headers":{"link":"<https://www.example.com/>; rel=\"canonical\""}}}'

Integrations

TypeScript SDK

import { Squillify } from "@squillify/sdk";

const sq = new Squillify({ apiKey: process.env.SQUILLIFY_API_KEY });

const { output } = await sq.execute("seo.validate_http_canonical", {"headers":{"link":"<https://www.example.com/>; rel=\"canonical\""},"documentUrl":"https://www.example.com/"});

Errors

Code	HTTP	Retryable	Description
VALIDATION_ERROR	400	No	The request payload failed schema validation.
UNAUTHORIZED	401	No	Missing or invalid API key.
SKILL_NOT_ACCESSIBLE	403	No	The API key is not granted access to this skill.
SKILL_NOT_AVAILABLE_FOR_PLAN	403	No	This skill is not included in your current plan.
PLAN_ELIGIBILITY_UNAVAILABLE	503	Yes	Plan eligibility could not be decided. Retry after backoff.
SKILL_NOT_FOUND	404	No	The requested skill or version does not exist.
TENANT_RATE_LIMITED	429	Yes	Request rate limit exceeded. Retry after backoff.
QUOTA_EXCEEDED	429	Yes	Plan quota exhausted. Retryable once the quota period resets.
EXECUTION_TIMEOUT	504	Yes	Execution exceeded the allowed time budget.
SEO_INPUT_REQUIRED	400	No	The request payload failed this skill's input validation.
SEO_INPUT_TOO_LARGE	429	No	A size, quota, rate, or time limit was exceeded.
SEO_HTML_MALFORMED	400	No	The request payload failed this skill's input validation.
SEO_XML_MALFORMED	400	No	The request payload failed this skill's input validation.
SEO_XML_DOCTYPE_NOT_ALLOWED	400	No	The request payload failed this skill's input validation.
SEO_JSONLD_MALFORMED	400	No	The request payload failed this skill's input validation.
SEO_PROFILE_UNKNOWN	400	No	The request payload failed this skill's input validation.
SEO_TOO_MANY_RECORDS	429	No	A size, quota, rate, or time limit was exceeded.
SEO_GRAPH_LIMIT_EXCEEDED	429	No	A size, quota, rate, or time limit was exceeded.
SEO_INVALID_URL	400	No	The request payload failed this skill's input validation.

Other limits

Limit	Value
Recommended inline bytes	32 KiB

Limitations

Does not fetch a URL, resolve DNS, or run a browser
Does not predict ranking, choose a winner, or claim live index status
Does not fetch or prefer a source
Fetching the URL
Choosing which canonical wins at Google

How to call

POST /v1/execute (requires authentication)

Request bodyjson

{
  "skillKey": "seo.validate_http_canonical",
  "input": {
    "headers": {
      "link": "<https://www.example.com/>; rel=\"canonical\""
    },
    "documentUrl": "https://www.example.com/"
  }
}

Examples

Primary business path

Inputjson

{
  "headers": {
    "link": "<https://www.example.com/>; rel=\"canonical\""
  },
  "documentUrl": "https://www.example.com/"
}

Expected outputjson

{
  "findings": [],
  "declarations": [
    "https://www.example.com/"
  ],
  "selfReferential": true,
  "count": 1,
  "documentUrl": "https://www.example.com/"
}

Tip

First realistic scenario for this skill.

Boundary or option path