Summary

Multi-byte branch name is not properly generated when downloading the branch as an archive.

Environment

• Bitbucket Server 5.7.1

Steps to Reproduce

1. Commit and push the branch whose name contains multi-byte characters (example.zip)
2. Open the branch on Bitbucket Server UI
3. Click "..." > "Download"
4. Verify the downloaded file
   • 

Expected Results

The downloaded filename should keep its original name example-feature-ja_あいうえお@03d2f9dbe49.

Actual Results

The filename corrupts like example-feature-ja______@03d2f9dbe49.
The multi-byte part is replaced with underscores.

Workaround

• Use ASCII for branch name