generated: '2026-08-29'
method: searched
source: live GET probes of /.well-known/* on every apis.yml and OpenAPI servers[] host, 2026-08-29
provider: Power Query
providerId: power-query
description: >-
  Well-known discovery probe across the Power Query / Microsoft Fabric host set.
  The product hosts themselves (api.fabric.microsoft.com / api.powerbi.com,
  learn.microsoft.com) serve nothing at /.well-known/. Microsoft centralises the
  two documents that do exist: the RFC 9116 security.txt on msrc.microsoft.com
  (which declares www.microsoft.com/.well-known/security.txt as its Canonical URI)
  and OIDC discovery on login.microsoftonline.com, which is the authorization
  server every Fabric / Power BI REST call authenticates against.
hit_count: 2
hosts:
  - host: https://msrc.microsoft.com
    note: >-
      Microsoft Security Response Center. Company-wide security.txt; its own
      Canonical field names https://www.microsoft.com/.well-known/security.txt,
      which is fronted by a bot challenge (403) for non-browser clients.
    documents:
      - path: /.well-known/security.txt
        status: 200
        file: power-query-security.txt
  - host: https://login.microsoftonline.com
    note: >-
      Microsoft Entra ID. The authorization server for api.fabric.microsoft.com
      and api.powerbi.com; feeds authentication/ and scopes/.
    documents:
      - path: /common/v2.0/.well-known/openid-configuration
        status: 200
        file: power-query-openid-configuration.json
      - path: /common/.well-known/oauth-authorization-server
        status: 404
      - path: /.well-known/security.txt
        status: 404
  - host: https://api.powerbi.com
    note: >-
      api.fabric.microsoft.com is a DNS alias for api.powerbi.com. Every probed
      path returned a genuine 404 with an empty body — not a catch-all.
    documents:
      - path: /.well-known/security.txt
        status: 404
      - path: /.well-known/openid-configuration
        status: 404
      - path: /.well-known/oauth-authorization-server
        status: 404
      - path: /.well-known/api-catalog
        status: 404
      - path: /.well-known/ai-plugin.json
        status: 404
      - path: /.well-known/agent-card.json
        status: 404
      - path: /.well-known/agent.json
        status: 404
  - host: https://learn.microsoft.com
    note: >-
      Docs host. Every path returned the standard 17,593-byte Learn 404 page —
      a real 404, not a soft-200.
    documents:
      - path: /.well-known/security.txt
        status: 404
      - path: /.well-known/openid-configuration
        status: 404
      - path: /.well-known/oauth-authorization-server
        status: 404
      - path: /.well-known/api-catalog
        status: 404
      - path: /.well-known/ai-plugin.json
        status: 404
      - path: /.well-known/agent-card.json
        status: 404
      - path: /.well-known/agent.json
        status: 404
      - path: /llms.txt
        status: 404
  - host: https://powerbi.microsoft.com
    note: >-
      Marketing host. Every /.well-known/* path returned a Cloudflare interstitial
      (403 "Just a moment...") even with a browser User-Agent — the probe could not
      be completed, so nothing is claimed for this host either way.
    documents:
      - path: /.well-known/security.txt
        status: 403
      - path: /.well-known/api-catalog
        status: 403
      - path: /.well-known/agent-card.json
        status: 403
  - host: https://www.microsoft.com
    note: Same bot challenge (403) as powerbi.microsoft.com; probe not completable.
    documents:
      - path: /.well-known/security.txt
        status: 403
      - path: /.well-known/agent-card.json
        status: 403
maintainers:
  - FN: Kin Lane
    email: kin@apievangelist.com
    url: https://apievangelist.com