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Codex Issues / #12903

VS Code extension opens file+.vscode-resource.vscode-cdn.net links in external browser

Resolved 💬 8 comments Opened Feb 26, 2026 by htazq Closed Feb 26, 2026
💡 Likely answer: A maintainer (github-actions[bot], contributor) responded on this thread — see the highlighted reply below.

Summary

Clicking certain file/reference links in the Codex VS Code extension opens the system browser with a URL like:

https://file+.vscode-resource.vscode-cdn.net/c%3A/Users/.../.vscode/extensions/openai.chatgpt-0.4.76-win32-x64/webview/...

The browser then fails with ERR_CONNECTION_CLOSED.

These links appear to be VS Code webview resource URLs and should not be handled as external web links.

Environment

  • Extension: openai.chatgpt 0.4.76 (win32-x64)
  • OS: Windows
  • VS Code: (can provide exact build if needed)

Actual behavior

  • Clicking a Codex-rendered reference/file link triggers external browser navigation.
  • External URL starts with https://file+.vscode-resource.vscode-cdn.net/...
  • Browser shows ERR_CONNECTION_CLOSED.

Expected behavior

  • Link should open inside VS Code (file in workspace + line navigation), or be rendered as non-clickable webview-internal resource.
  • It should not call external browser for file+.vscode-resource... URLs.

Repro steps (minimal)

  1. In Codex panel, generate a response containing a clickable file/reference link.
  2. Click the link.
  3. Observe that VS Code opens default browser to file+.vscode-resource.vscode-cdn.net URL.
  4. Browser fails with ERR_CONNECTION_CLOSED.

Notes

  • This seems related to link handling/routing (internal IDE resource vs external URI).
  • Related (not same symptom): #12661 (file links opening in browser).

View original on GitHub ↗

8 Comments

github-actions[bot] contributor · 4 months ago

Potential duplicates detected. Please review them and close your issue if it is a duplicate.

  • #12661

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htazq · 4 months ago

Additional details for triage:

  • VS Code version: <paste exact version from Help -> About>
  • Reproducibility: <Always / Intermittent>
  • First observed in extension version: 0.4.76
  • Full sanitized URL sample:

https://file+.vscode-resource.vscode-cdn.net/c%3A/Users/<redacted>/.vscode/extensions/openai.chatgpt-0.4.76-win32-x64/webview/...

If useful, I can also provide renderer/exthost logs from VS Code Developer Tools.

evaxes · 4 months ago

here is the same issue as well.

prince76007 · 3 months ago

Facing the same issue.

1111esaese · 3 months ago

Facing the same issue.

logless · 3 months ago

have been pinging OpenAI devs on X for weeks regarding this issue.. Sometimes, sporadically it gets fixed (the file opens, sometimes even with the specific line focused), but it is very inconsistent. I can't believe they can't make it to work properly. The raw LLM output is usually something like

[file.py](d:/Dev/file.py#L68)

but the extension consistently fails to render it properly.

tomchangg · 3 months ago

Facing the same issue.

serhii-rieznik · 3 months ago

Still the same issue.