CORS checks for agent-generated web services

CORS testing for agent-generated web services should validate the browser-visible access policy rather than merely confirm that a server configuration resolves an integration error, since overly broad origin rules or credential settings can expose authenticated responses to untrusted sites. Effective tests define an explicit matrix of permitted schemes, hosts, and ports, include malformed, null, sibling-domain, and unrelated origins, and distinguish public endpoints from credentialed or administrative routes. Both OPTIONS preflight and actual requests must be tested for allowed and denied origins, checking headers such as allowed origins, methods, headers, credentials, cache behavior, and response variation by Origin, while recognizing that successful status codes do not establish browser access. Credentialed requests require an exact allowed origin rather than a wildcard, and reflected origins must be validated against an allowlist. Teams should provide coding agents with specific acceptance criteria, run isolated server and browser-level tests using synthetic accounts rather than production credentials, preserve evidence for reviewers, inspect redirects, and maintain a clear separation between browser CORS controls and server-side authentication and authorization as service boundaries evolve.

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