Cannot view README/Markdown files in Preview view.

[schwinbp]

Is there an existing issue for this?

• I have searched the existing issues

OS/Web Information

• Web Browser: Edge & Chrome
• Local OS: Windows 11
• Remote OS: Amazon Linux 2023
• Remote Architecture: Linux
• code-server --version:
  code-server: v4.108.2
  Code: 1.108.2
  Commit: 3c0b449
  Date: 2026-01-26T20:52:05.876Z (1 wk ago)
  Browser: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/144.0.0.0 Safari/537.36 Edg/144.0.0.0

Steps to Reproduce

1. Open readme.md file
2. Right-click on tab for file
3. Select "Open Preview"
4. See blank file

Expected

Should see markdown file in preview mode displaying proper fonts.

Actual

Blank file

Logs

Screenshot/Video

No response

Does this bug reproduce in native VS Code?

No, this works as expected in native VS Code

Does this bug reproduce in VS Code web?

I did not test VS Code web

Does this bug reproduce in GitHub Codespaces?

I did not test GitHub Codespaces

Are you accessing code-server over a secure context?

• I am using a secure context.

Notes

No response

[benz0li]

@schwinbp I assume you are not accessing via HTTPS.

1. For localhost/127.0.0.1 HTTP is sufficient
2. For anything else you need TLS encryption
   • This means providing a secure connection over HTTPS

ℹ Use a reverse proxy like Caddy, Nginx, Træfik, etc.

Originally posted by @benz0li in #7168 (comment)