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gitea-mirror/src
ARUNAVO RAY 0000a03ad6 fix: improve reverse proxy support for subdomain deployments (#237)
* fix: improve reverse proxy support for subdomain deployments (#63)

- Add X-Accel-Buffering: no header to SSE endpoint to prevent Nginx
  from buffering the event stream
- Auto-detect trusted origin from Host/X-Forwarded-* request headers
  so the app works behind a proxy without manual env var configuration
- Add prominent reverse proxy documentation to advanced docs page
  explaining BETTER_AUTH_URL, PUBLIC_BETTER_AUTH_URL, and
  BETTER_AUTH_TRUSTED_ORIGINS are mandatory for proxy deployments
- Add reverse proxy env var comments and entries to both
  docker-compose.yml and docker-compose.alt.yml
- Add dedicated reverse proxy configuration section to .env.example

* fix: address review findings for reverse proxy origin detection

- Fix x-forwarded-proto multi-value handling: take first value only
  and validate it is "http" or "https" before using
- Update comment to accurately describe auto-detection scope: helps
  with per-request CSRF checks but not callback URL validation
- Restore startup logging of static trusted origins for debugging

* fix: handle multi-value x-forwarded-host in chained proxy setups

x-forwarded-host can be comma-separated (e.g. "proxy1.example.com,
proxy2.example.com") in chained proxy setups. Take only the first
value, matching the same handling already applied to x-forwarded-proto.

* test: add unit tests for reverse proxy origin detection

Extract resolveTrustedOrigins into a testable exported function and
add 11 tests covering:
- Default localhost origins
- BETTER_AUTH_URL and BETTER_AUTH_TRUSTED_ORIGINS env vars
- Invalid URL handling
- Auto-detection from x-forwarded-host + x-forwarded-proto
- Multi-value header handling (chained proxy setups)
- Invalid proto rejection (only http/https allowed)
- Deduplication
- Fallback to host header when x-forwarded-host absent
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