Fixed 'invalid character '\x1f' looking for beginning of value' error when sending images: - Added accept-encoding to filtered headers in complete passthrough mode - This prevents upstream from returning gzip compressed responses that new-api cannot parse - Issue occurred when clients (like image uploads) had compression headers passed through directly 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>