generated: '2026-08-26'
method: searched
source: probed each Plotly host directly on 2026-08-26
note: >-
  Plotly serves a real RFC 9728 OAuth protected-resource document for its Dash Docs MCP server,
  and its Plotly Cloud sign-in host (signin.cloud.plotly.com) serves both RFC 8414 authorization
  server metadata and OpenID Connect discovery. Two important caveats are recorded below.
  (1) dash.plotly.com is a single-page-app catch-all: every /.well-known/* path returns HTTP 200
  with the same 142,024-byte HTML documentation shell, so a bare 200 there is NOT a document.
  Only /.well-known/oauth-protected-resource/_mcp returns application/json and is recorded as a
  hit. (2) plotly.com returns a genuine 404 (195,028-byte HTML error page) for every
  /.well-known/* path probed.
hosts:
- host: https://dash.plotly.com
  documents:
  - path: /.well-known/oauth-protected-resource/_mcp
    status: 200
    content_type: application/json
    file: plotly-oauth-protected-resource.json
  - path: /.well-known/oauth-protected-resource
    status: 200
    content_type: text/html
    note: SPA catch-all shell (142024 bytes) - not a document
  - path: /.well-known/security.txt
    status: 200
    content_type: text/html
    note: SPA catch-all shell (142024 bytes) - not a document
  - path: /.well-known/openid-configuration
    status: 200
    content_type: text/html
    note: SPA catch-all shell (142024 bytes) - not a document
  - path: /.well-known/oauth-authorization-server
    status: 200
    content_type: text/html
    note: SPA catch-all shell (142024 bytes) - not a document
  - path: /.well-known/api-catalog
    status: 200
    content_type: text/html
    note: SPA catch-all shell (142024 bytes) - not a document
  - path: /.well-known/agent-card.json
    status: 200
    content_type: text/html
    note: SPA catch-all shell (142024 bytes) - not a document
  - path: /.well-known/agent.json
    status: 200
    content_type: text/html
    note: SPA catch-all shell (142024 bytes) - not a document
  soft_404_control:
    probe: /.well-known/agent-card.json
    status: 200
    bytes: 142024
    content_type: text/html
    verdict: catch-all - identical body served for every /.well-known/* path
  hit_count: 1
- host: https://signin.cloud.plotly.com
  documents:
  - path: /.well-known/openid-configuration
    status: 200
    content_type: application/json
    file: plotly-openid-configuration.json
  - path: /.well-known/oauth-authorization-server
    status: 200
    content_type: application/json
    file: plotly-oauth-authorization-server.json
  hit_count: 2
- host: https://plotly.com
  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
  hit_count: 0
summary:
  hosts_probed: 3
  documents_served: 3
  security_txt: false
  api_catalog: false
  agent_card: false