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Security Policy

Sec-Fetch-User

IANA permanent

Registered with IANA and declared by no provider in the APIs.io network.

What this header is for, and how to use it →

A count here is providers whose published contract declares this header — not providers who send it. Response headers set at the edge rarely appear in an OpenAPI at all, so a low number can measure documentation practice rather than deployment.

The registry

Statuspermanent
Referencehttps://www.w3.org/TR/fetch-metadata/#sec-fetch-user-header
Structured typeItem (RFC 9651)

Explore

All headers Security Policy Guidance on headers.apievangelist.com

Work with this as data

Every header here is available over the APIs.io API and to AI agents over MCP. HTTP Headers is not yet its own endpoint on the v1 API. Reach it through catalog search and the tag graph, or the MCP server.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for http headers

3 MCP tools reach this
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools →

Call it yourself

curl for this page
Search the catalog 
curl "https://apis.io/api/v1/search?q=sec-fetch-user&limit=10"
Everything under a tag 
curl "https://apis.io/api/v1/tags/sec-fetch-user"

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