Content-Disposition header cannot contain non-ASCII characters. Use RFC 5987 encoding (filename*=UTF-8'') for proper Cyrillic filename support, with ASCII-only fallback in the base filename. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Content-Disposition header cannot contain non-ASCII characters. Use RFC 5987 encoding (filename*=UTF-8'') for proper Cyrillic filename support, with ASCII-only fallback in the base filename. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>