generated: '2026-06-20'
method: searched
source: probed /.well-known/ on the AppSync service hosts and the aws.amazon.com corporate host
notes: >-
  The AppSync control-plane hosts (appsync.<region>.amazonaws.com) are SigV4
  signed API endpoints and return HTTP 403 for all unauthenticated /.well-known/
  probes; they publish no discovery documents. A valid RFC 9116 security.txt is
  published at the corporate aws.amazon.com host and is captured verbatim.
hosts:
  - host: https://appsync.us-east-1.amazonaws.com
    documents:
      - path: /.well-known/security.txt
        status: 403
      - path: /.well-known/openid-configuration
        status: 403
      - path: /.well-known/oauth-authorization-server
        status: 403
      - path: /.well-known/api-catalog
        status: 403
      - path: /.well-known/ai-plugin.json
        status: 403
  - host: https://aws.amazon.com
    documents:
      - path: /.well-known/security.txt
        status: 200
        file: amazon-appsync-security.txt