- Add comprehensive validation for timestamps and date strings in conditional headers
- Normalize all dates to RFC 7231 compliant UTC format before sending
- Fall back to ETag handling when date parsing fails
- Add detailed logging for debugging server compatibility issues
- Add unit tests for invalid date/timestamp scenarios
- Document conditional headers behavior and limitations
This ensures more robust handling of various WebDAV server implementations
and prevents sending malformed conditional headers that could be ignored
or cause errors.
