Spring Security 6 MvcRequestMatcher (used when no HttpMethod is specified
and Spring MVC is on the classpath) fails to match the upload endpoint,
falling through to anyRequest().authenticated() and returning 401.
Specifying HttpMethod forces AntRequestMatcher which matches reliably.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
The previous commit (GET-only permitAll) inadvertently broke upload by
requiring auth. The original design intentionally allows unauthenticated
upload — explicitly permit POST /api/file/upload to make this clear.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Upload endpoint (POST) was inadvertently matched by the method-less
requestMatchers("/api/file/*") rule. Making it GET-only makes the intent
explicit and ensures upload correctly requires a valid JWT.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Spring Security's default Http403ForbiddenEntryPoint was returning 403
for all auth failures. Frontend clients treat 403 as a permission error
(not an auth error), so silent loops occurred instead of proper re-login.
Adding a custom AuthenticationEntryPoint that returns 401 makes clients
handle auth failures correctly (show login page on 401).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
