[Bug]: Hash in filename (e.g. #foo.docx) breaks web interface download

[wolfgang-braun]

⚠️ This issue respects the following points: ⚠️

• This is a bug, not a question or a configuration/webserver/proxy issue.
• This issue is not already reported on Github OR Nextcloud Community Forum (I've searched it).
• Nextcloud Server is up to date. See Maintenance and Release Schedule for supported versions.
• I agree to follow Nextcloud's Code of Conduct.

Bug description

Downloading a file that has a hash in the name doesn't work anymore when clicking on the file row.
Context menu / 3 dot menu -> download still works

Steps to reproduce

1. Upload file #foo.docx
2. Click on file row to open it (in this case download it as file)
3. A file with the correct name is downloaded. It's corrupt because it has the following content:

This is the WebDAV interface. It can only be accessed by WebDAV clients such as the Nextcloud desktop sync client

This is because the UI tries to download the folder, not the file.
This might be because it ignores everything in the URL that comes after #

Note: This behavior can't be reproduced for PDFs when the PDF viewer is active.

Expected behavior

1. Upload file '#foo.docx'
2. Click on file row to open (in this case download) it
3. A file with the correct name is downloaded. It's a copy of the uploaded file.

Installation method

Community Docker image

Nextcloud Server version

28

Operating system

None

PHP engine version

None

Web server

None

Database engine version

None

Is this bug present after an update or on a fresh install?

None

Are you using the Nextcloud Server Encryption module?

None

What user-backends are you using?

• Default user-backend (database)
• LDAP/ Active Directory
• SSO - SAML
• Other

Configuration report

No response

List of activated Apps

No response

Nextcloud Signing status

No response

Nextcloud Logs

No response

Additional info

No response

[SubZero84]

Same when folder has # in name.

[susnux]

Work around: Use the action (tree dot menu and then the "download" entry)